HealthCareMagic is now Ask A Doctor - 24x7 | https://www.askadoctor24x7.com

question-icon

How To Find The Date Of Conception Using Due Date?

default
Posted on Thu, 30 Apr 2015
Question: if your due date is july 5 2015 what are your most accurate dates of conception?
doctor
Answered by Dr. Dr. Rovena (1 hour later)
Brief Answer:
detailed below.

Detailed Answer:
Hello.

Welcome to Healthcare Magic.

Means that the first day of your last period was September 28 ,2014.
The ovulation occurs in the middle of the menstrual cycle (day 14 ) ,2 weeks after the last period .In your case it will be October 12 ,2014.
The egg can live 24 hours after the release and the sperm can live for three to five days in female reproductive organs.
This mans that conception may have occurred in a period of 6 days ,5 days before ovulation and 1 day after ovulation.
So the possible dates of conception are October 7 to October 13 .

This is calculated presuming that the cycle was a regular 28-day cycle and that the first date of your last period was exactly September 28.

Hope this helps.
Let me know if you have any doubt to clarify.

Kind regards,
Dr.Rovena Murati

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
default
Follow up: Dr. Dr. Rovena (4 hours later)
hey i'm confused because i said that according to her due date her period should've been around the 28th but she's trying to say her pms was oct 1 she missed it nov 1st and she conceived in oct 18 saturday night or 19 but her due date july 5
i think she's lying on me because she's saying her due date is july 5 but that means she was already pregnant before oct 18
every sunday she turns a new week like yesterday april 12th she turned 28 weeks.
doctor
Answered by Dr. Dr. Rovena (12 hours later)
Brief Answer:
detailed below.

Detailed Answer:
Hello again.

I apologize for the delay in answering you.

It is difficult to tell for sure when the conception occurred because it may happen that she doesn't have a 28 days cycle or might have irregular periods and in this case is difficult to predict the time of ovulation.

If she has regular periods and a 28 days cycle ,then most likely conception should have happened between October 7- October 13.
We don't know for sure which method was used to calculate the due date :First day of last period or date of conception .
If First day of last period was used ,then she had her last periods on September 28 .
There are just few days between this and 1 October so this doesn't make a big difference.
If her last period was on October 1 ,then the ovulation would be on October 15 and the conception date would be between October 10 and October 16 .
This would be true only if she has a 28 days cycle and regular periods.

So you can see that the difference is just a few days and it is impossible to predict the conception date precisely .

The only way to know for sure that she is lying is to do the paternity test.

Hope it helps.
Let me know if you need further help.

Kind regards,
Dr.Rovena
Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
default
Follow up: Dr. Dr. Rovena (8 minutes later)
she said she missed her pms nov 1st but she didn't find out she was pregnant until december . she goes on pms every first of the month
doctor
Answered by Dr. Dr. Rovena (6 hours later)
Brief Answer:
detailed below.

Detailed Answer:
Hello.

It seems that she have regular periods, so considering that her due date is July 5 ,the possible dates of conception are October 7 to October 13 .

Take care.
Dr.Rovena
Note: For further follow up on related General & Family Physician Click here.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
doctor
Answered by
Dr.
Dr. Dr. Rovena

General & Family Physician

Practicing since :2013

Answered : 1243 Questions

premium_optimized

The User accepted the expert's answer

Share on

Get personalised answers from verified doctor in minutes across 80+ specialties

159 Doctors Online

By proceeding, I accept the Terms and Conditions

HCM Blog Instant Access to Doctors
HCM Blog Questions Answered
HCM Blog Satisfaction
How To Find The Date Of Conception Using Due Date?

Brief Answer: detailed below. Detailed Answer: Hello. Welcome to Healthcare Magic. Means that the first day of your last period was September 28 ,2014. The ovulation occurs in the middle of the menstrual cycle (day 14 ) ,2 weeks after the last period .In your case it will be October 12 ,2014. The egg can live 24 hours after the release and the sperm can live for three to five days in female reproductive organs. This mans that conception may have occurred in a period of 6 days ,5 days before ovulation and 1 day after ovulation. So the possible dates of conception are October 7 to October 13 . This is calculated presuming that the cycle was a regular 28-day cycle and that the first date of your last period was exactly September 28. Hope this helps. Let me know if you have any doubt to clarify. Kind regards, Dr.Rovena Murati