Trying to understand your fertility can feel like waiting for an answer your body is not ready to give. A guide to fertility ultrasound can help make the process feel clearer by explaining what a scan can assess, why the timing matters and what the results may mean for your next conversation with a healthcare professional.
A fertility ultrasound is not a test of whether you will or will not become pregnant. It is a detailed look at the uterus and ovaries, offering valuable information about the structures involved in conception. For many people, that information brings reassurance. For others, it can identify findings that deserve further investigation or support.
What is a fertility ultrasound?
A fertility ultrasound is a pelvic scan used to assess reproductive anatomy and, where appropriate, signs of ovarian activity. It is usually performed by a qualified sonographer and may be carried out abdominally, transvaginally, or using both approaches.
An abdominal scan is completed over the lower tummy. You may be asked to attend with a comfortably full bladder, as this can help provide a clearer view of the pelvic organs. A transvaginal scan uses a slim, covered ultrasound probe inserted gently into the vagina. It gives a much closer view of the uterus and ovaries and is often the most informative part of a fertility assessment.
It is understandable to feel apprehensive about an internal scan, especially if this is new to you. The examination should be explained clearly before it begins, your consent is required and you can ask questions or stop the scan at any point. A transvaginal ultrasound does not use radiation and is widely used in gynaecological and fertility care.
What can a fertility scan look for?
The scan is tailored to your symptoms, cycle stage and reason for attending. Your sonographer may assess the shape, size and position of the uterus, as well as the appearance of the endometrium, which is the lining of the womb.
They will usually examine both ovaries for follicles. Follicles are small fluid-filled sacs that contain developing eggs. The number of small resting follicles seen at the start of a cycle is known as the antral follicle count. This can be one useful indicator of ovarian reserve, alongside your age, medical history and blood test results.
A scan can also identify or help assess conditions that may affect fertility or cause symptoms, including:
- fibroids, which are non-cancerous growths in or around the uterus
- ovarian cysts, including endometriomas that can be associated with endometriosis
- polycystic ovarian morphology, which may be seen in some people with PCOS
- uterine polyps or features that may need further assessment
- signs of adenomyosis or pelvic fluid, depending on the individual picture
Finding one of these features does not automatically explain difficulty conceiving. Fibroids, for example, are common and often have no effect on fertility. PCOS cannot be diagnosed from ultrasound alone. A clinician will consider scan findings alongside your periods, symptoms, hormone results and wider health.
What a scan cannot tell you on its own
Ultrasound is extremely useful, but it has limits. It cannot directly show egg quality, confirm whether an egg has been released in every cycle or diagnose all causes of infertility. It also cannot reliably confirm whether the fallopian tubes are open.
If tubal patency is a concern, a clinician may recommend a different investigation, such as a HyCoSy or another specialist test. Semen analysis is also an essential part of many fertility assessments. Fertility is shared, and looking at only one partner can delay useful answers.
When should you book a fertility ultrasound?
The best timing depends on what your clinician needs to assess. For an antral follicle count and a baseline view of the ovaries, a scan is often arranged in the early part of the menstrual cycle, commonly between days 2 and 5. Day 1 is the first day of full menstrual bleeding.
Early-cycle scanning can make small follicles easier to count and offers a useful baseline before ovulation. If you are monitoring ovulation, however, scans may be arranged later and sometimes repeated across the cycle to observe follicle development and changes to the womb lining.
If your periods are irregular, you have not had a period for some time, or you are using hormonal contraception, do not assume that the scan is not worthwhile. Let the clinic know when you book. The team can advise on the most suitable appointment timing based on your circumstances and the purpose of the scan.
How to prepare for your appointment
Preparation is usually straightforward, but the instructions can differ depending on whether you are having an abdominal or transvaginal scan. Follow the guidance provided by your clinic rather than relying on general advice.
For an abdominal pelvic scan, you may need a full bladder. This helps lift the uterus into view and creates a clearer ultrasound window. For a transvaginal scan, you will normally be asked to empty your bladder just before the examination for comfort and better imaging.
Wear clothes that are easy to change out of and bring any relevant information, such as the date of your last period, details of previous pregnancies, fertility treatment, surgery, test results and medications. If you have pelvic pain, unusual bleeding or concerns about possible pregnancy, mention this before the scan begins.
There is no need to feel embarrassed about asking for a chaperone, a pause or a fuller explanation of what is happening on screen. Sensitive care is part of good clinical care.
What happens during the scan?
Your appointment will begin with a short discussion about your medical history, cycle and symptoms. This context matters. A scan image has more meaning when it is considered alongside the reason you are seeking help.
During an abdominal scan, gel is applied to the skin and the sonographer moves a probe across your lower abdomen. During a transvaginal scan, the probe is covered and lubricated before gentle insertion. You may feel pressure, but the scan should not be painful. Tell the sonographer promptly if you experience discomfort.
The examination itself often takes around 15 to 30 minutes, although this varies. The sonographer may take measurements and still images of the uterus, endometrium and ovaries. In some settings, you may receive an explanation during the appointment; in others, a report is sent to the referring clinician. Ask when and how you will receive your results, so you are not left waiting without clarity.
Understanding common fertility ultrasound results
Words on an ultrasound report can sound alarming without context. “Follicles present” is usually a normal observation. The size and number of follicles must be interpreted according to where you are in your cycle and whether you are taking fertility medication.
An endometrial thickness measurement is also not a verdict on fertility. The lining naturally changes throughout the month, becoming thicker after a period and before a potential implantation window. A measurement that is appropriate at one point in the cycle may be entirely different at another.
If a cyst, fibroid or possible polyp is found, the next step depends on its type, size, position and whether you have symptoms. Some findings simply need monitoring. Others may lead to a GP, gynaecology or fertility specialist referral, further imaging, blood tests or a discussion about treatment.
A normal scan is meaningful too. It can provide reassurance that the uterus and ovaries appear structurally healthy, while helping your healthcare team decide whether hormone testing, ovulation assessment, semen analysis or tubal testing should be considered next.
When to seek advice sooner
Book medical advice promptly if you have severe or worsening pelvic pain, heavy bleeding, fainting, shoulder-tip pain, fever, a positive pregnancy test with pain or bleeding, or symptoms that feel suddenly different from usual. A fertility scan is valuable, but urgent symptoms need timely clinical assessment.
If you have been trying to conceive for 12 months without success, it is sensible to seek advice. If you are aged 35 or over, have irregular or absent periods, known endometriosis, previous pelvic infection, prior ectopic pregnancy, recurrent miscarriage or concerns about sperm health, it may be appropriate to ask for support sooner.
At Miracle Scan, fertility and women’s health imaging is carried out in a calm, professional environment by qualified sonographers, with the aim of giving you clear information and a supportive experience. The right scan is not about searching for certainty in one appointment. It is about giving you a well-informed next step, with care for both the clinical details and the person experiencing them.