Tools
Ovulation and fertile window calculator
See your likely fertile days and your next periods for the coming three cycles.
Everything is calculated on your phone. Nothing you enter is stored or sent anywhere.
This is not a method of contraception.
How this works
Ovulation usually happens about 14 days before the next period starts, whatever the length of the cycle. The fertile window is the five days before ovulation and the day of ovulation itself, because sperm can survive for up to five days.
Sources
- Wilcox, Weinberg and Baird, NEJM 1995: Timing of sexual intercourse in relation to ovulation
- ACOG: Fertility awareness-based methods of family planning
This is an estimate to help you plan, not a diagnosis. Your doctor may advise differently.
Common questions
Questions we are asked most.
General information, not medical advice for your situation. Bring your own question to a consultation.
Ask on WhatsApp- How long should we try before seeing a fertility specialist?
- Generally one year of regular unprotected sex if you are under 35, and six months if you are 35 or older. Come sooner if your periods are irregular or absent, if you have known PCOS or endometriosis, if you have had pelvic surgery, or if you have had two or more miscarriages.
- Does PCOS mean I will not be able to get pregnant?
- No. PCOS affects how regularly you ovulate, not whether you can conceive at all, and many women with PCOS become pregnant. Treatment usually starts with weight, insulin and cycle management, then ovulation induction if needed, well before assisted treatment is considered.
Appointments
Bring the question you have been putting off.
Tell us your name, a number to reach you on and roughly what it is about. Nothing medical is needed to book. That conversation belongs in the room.