Aa
Timing
Today is July 20th 2013, im officially 11 weeks and 5 days , my partner is having a hard time believing that the child im carrying isn't his . He wants to know the date the baby was conceived ? how can I find out ? my last menstrual cycle was April 25th 2013 , and on most apps, im 12 weeks and 2 days but I got a Ultrasound done today and it determined I am 11 weeks and 5 days. So please can someone help me figure out when i conceived my child. Its my first pregnancy.
COMMUNITY LEADER
When you had the ultrasound, did they give you an estimated due date? (It might be listed on the ultrasound as an "EDD.") You count back 266 days from that date, to get to an estimated conception date. There are also online calculators that will do this.
The 11 weeks 5 days figure that they give you to date your pregnancy is counted from the (assumed) first day of your last period, not because they think you got pregnant that day (obviously you were bleeding and did not get pregnant on Day 1 of your cycle) but because that is simply where they begin the count.
A woman with average length cycles would ovulate about two weeks after the first day of her last period, give or take a day or two, and would conceive within 24 hours of ovulating. But if your cycles are irregular, counting forward 14 days or so from the first day of the last period is not a totally reliable way to tell when she conceived. Getting an ultrasound and then computing backward from the estimated due date that it names, is the most reliable way to assess conception date. (This is especially true if the ultrasound is early. The later in the pregnancy the ultrasound, the more "plus or minus x days" it is, because babies grow at different rates.)
Ultrasounds are more reliable than computing forward from the first day of your last period because the ultrasound sees and measures the actual baby. It then computes forward to the estimated due date and backward to a presumed first day of last period, based on the size and development of the embryo.
That all said (and it was a mouthful!!) I get a conception date of around May 13 just counting from a calendar. Send me your estimated due date and I'll run it through the calculator to check my work for you.
The 11 weeks 5 days figure that they give you to date your pregnancy is counted from the (assumed) first day of your last period, not because they think you got pregnant that day (obviously you were bleeding and did not get pregnant on Day 1 of your cycle) but because that is simply where they begin the count.
A woman with average length cycles would ovulate about two weeks after the first day of her last period, give or take a day or two, and would conceive within 24 hours of ovulating. But if your cycles are irregular, counting forward 14 days or so from the first day of the last period is not a totally reliable way to tell when she conceived. Getting an ultrasound and then computing backward from the estimated due date that it names, is the most reliable way to assess conception date. (This is especially true if the ultrasound is early. The later in the pregnancy the ultrasound, the more "plus or minus x days" it is, because babies grow at different rates.)
Ultrasounds are more reliable than computing forward from the first day of your last period because the ultrasound sees and measures the actual baby. It then computes forward to the estimated due date and backward to a presumed first day of last period, based on the size and development of the embryo.
That all said (and it was a mouthful!!) I get a conception date of around May 13 just counting from a calendar. Send me your estimated due date and I'll run it through the calculator to check my work for you.
Have an Answer?
You are reading content posted in the DNA / Paternity Community
Get information and tips on how to help you choose the right place to deliver your baby.
Get the facts on how twins and multiples are formed and your chance of carrying more than one baby at a time.
Learn about the risks and benefits of circumcision.
What to expect during the first hours after delivery.
Learn about early screening and test options for your pregnancy.
Learn about testing and treatment for GBS bacterium.
