Dr. Sameer Kumar
MBBS., MS (OBS/GYNAE)., FMAS., DMAS., FELLOWSHIP IS ASSISTED REPRODUCTIVE TECHNIQUES
Infertility, Obstetrics And Gynaecology
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As the follicular size has already crossed 22 mm, there are high chances that you would ovulate in the next 24 hours naturally. However, by rule hCG dose is offered when the largest follicular size has crossed 20 mm, so you should be taking it today. After the injection, the ovulation is expected in the next 36 hours after the LH (luteinizing hormone) surge.
So we advise intercourse from the very next day of hCG injection daily for the next three days to increase chances of conception. After ovulation, the egg is available for the next 24 hours when fertilization can occur as the egg starts to degenerate post 24 hours of ovulation. It has to be followed daily transvaginal ultrasound to watch for ovulation.
If you ovulate by today night and see a ruptured follicle tomorrow then next 24 hours would be crucial for conception. In your case where sex is planned on three days from now if the follicle does not rupture naturally then you can take an hCG injection in the morning before the day of meeting your husband. And you expect egg after ovulation to be viable till that day and the next day when you can opt for frequent sex to increase chances of conception. All this provided follicle does not rupture until tomorrow evening.