I am 28.5 weeks pregnant. My due date is 22 April 2011. I remember the beginning of my last period to be 10 July 2010. I would like to find out my conception date. I had unprotected sex with a different person on the 18th of July and with my partner on the...
Hallow Madam, I hope I can be of help to you today. The due date of delivery (DD) is calculated by a formula DD= Last Menstrual Period date (LMP) + 9 months + 7 days. Since you had your LMP on 10 July 2010, the DD would be on 17 April 2011. If DD provided to you is by ultrasonography, a variation of one week is acceptable as Ultrasonography calculated DD is by the size of the baby and is calculated from the date of conception. To calculate the date of egg release (ovulation), it happens 14 days before the next expected menses. So considering your menstrual cycle of 30 or 31 days, next menses would be on 10 August and ovulation would be on 28 July 2010. The life of an egg is 24 hours and the sperms are active for 72 hours. Hence, a period of one week around the ovulation is fertile period. So your fertile period would be 24 July to 1 August. Thus, the conception would be in that period. Now in this calculation, you have to make some modifications depending on the periodicity of your menstrual cycle. Then you can locate your fertile period of that cycle. Thus, the intercourse(s) during this fertile period are likely to cause the pregnancy. If you had a solitary intercourse during fertile period, that day or within 4 days of that day would be the day of conception. Of course this all is based on the clinical calculations. If you want to ascertain the paternity of your child for any legal cause, you may go for DNA test which would be a foolproof evidence. I hope this helps you. 