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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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How To Determine The Date Of Conception?

I am currently pregnant. My due date is Oct. 21 which is projected by an ultrasound done in my first tri. I had intercourse with one man on Jan. 10th and another man thereafter... By my projected due date my conception date would have been Jan. 28th, I want to know how accurate this is and if i need to worry?                                                                  
Wed, 30 Dec 2015
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OBGYN,  's  Response
Hallow Dear,

Due date of delivery is calculated as 9 months and 7 days from the last menstrual period date. You had intercourse on January 10 meaning thereby that the egg release and conception has taken place on 10 January. Thus if you had your conception around January 10, your probable date of menstruation would be 14 - 16 days prior to that as the egg release takes place 14 days prior to the next menses. So let me presume that your menses were on 26 December. Then in that case, the due date would be 2 October. This day happens to be 26 December + 9months + 7 days.

21 Oct is projected by ultrasound. Ultrasound measures the period of gestation as per the size of the baby and hence is supposed to be more accurate. It differs from the due date calculated by LMP by a week or so.

I hope this clarifies the dilemma in your mind.

Dr. Nishikant Shrotri
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How To Determine The Date Of Conception?

Hallow Dear, Due date of delivery is calculated as 9 months and 7 days from the last menstrual period date. You had intercourse on January 10 meaning thereby that the egg release and conception has taken place on 10 January. Thus if you had your conception around January 10, your probable date of menstruation would be 14 - 16 days prior to that as the egg release takes place 14 days prior to the next menses. So let me presume that your menses were on 26 December. Then in that case, the due date would be 2 October. This day happens to be 26 December + 9months + 7 days. 21 Oct is projected by ultrasound. Ultrasound measures the period of gestation as per the size of the baby and hence is supposed to be more accurate. It differs from the due date calculated by LMP by a week or so. I hope this clarifies the dilemma in your mind. Dr. Nishikant Shrotri