Your fertile window: how to tell when you're ovulating
Written by the Zoya team · Medically reviewed by Dr. Saima Gulnaz, MBBS, FCPS · September 2026
Knowing when you're fertile is the first step for most couples trying to conceive. Here's what the fertile window is, how to recognise ovulation, and how often intercourse actually needs to happen.
What is the fertile window?
The days on which the chance of getting pregnant is higher are called fertile days. Pregnancy is most likely if intercourse occurs in the 5 days before ovulation and on the day of ovulation itself.
How do I know if I'm ovulating?
Ovulation may be identified by regular menstrual cycles, basal body temperature changes, ovulation predictor kits (LH tests), ultrasound monitoring, or blood progesterone testing.
How often should we have intercourse to conceive?
Intercourse every 1 to 2 days during the fertile days is enough. Daily intercourse is safe but not necessary for most couples.
More questions our doctors have answered
Does age affect fertility, or is that a myth?
Age genuinely matters — it's not a myth. Female fertility declines after 30 and more rapidly after 35; both the number and quality of eggs decrease. In men, fertility also declines, but gradually.
Does stress affect fertility?
Stress may indirectly contribute to infertility by disturbing your cycle, affecting sexual function, and affecting overall well-being.
What other factors can affect fertility?
Weight gain or loss, stress, smoking, alcohol, caffeine, diet, and exercise can all play a role. (If your periods are also irregular, our guide to PCOS and fertility covers one common hormonal cause.)
I'm ovulating regularly — why am I not conceiving?
Regular cycles mean regular ovulation, but that doesn't guarantee fertility on its own. Other factors — problems in the fallopian tubes, male infertility, endometriosis, and adhesions — can prevent pregnancy even when ovulation itself is working normally. (Our guide on why both partners should be checked covers what a fuller evaluation looks like.)
When to see a doctor
Seek medical help after 12 months of trying if you're under 35. Seek help sooner — after 6 months — if you're 35 or older, have irregular cycles, have had any pelvic infection, or have any mass diagnosed on ultrasound.
Log BBT and LH tests to see your fertile window clearly, and export doctor-ready stats with Zoya.
Related
- PCOS and fertility: can you still get pregnant?
How PCOS affects fertility, whether irregular periods rule out pregnancy, and how lifestyle changes can help.
- Trying to conceive for a year? Why both partners should be checked
What counts as infertility, why it isn't 'the woman's fault', what causes it on either side, and what evaluation and treatment actually involve.
Zoya provides educational information and is not a substitute for professional medical care.