Pregnant after MC – Calculating Due Date?

posted 1 year ago in Pregnancy
Post # 2
2995 posts
Sugar bee
  • Wedding: July 2011

You can date from MC or ovulation date. Ov date is likely to be closer to your due date. To get a more accurate EDD you will have to wait until the ultrasound.

I would see if you could wait until you are 8 or 9 weeks for that though. I have heard of so many women who have had early scans only to be told baby isn’t as far along as expected and then had weeks of worry only to find out it is OK. By 8 weeks or so the dating will be more accurate.

I know it is hard when you have had a MC though so you might feel better having an US early.

Post # 3
3263 posts
Sugar bee
  • Wedding: March 2017

The same thing happened to me. The lab can be wrong if you your hormone levels didn’t go down to zero in between pregnancies… when you go for your confirmation of pregnancy ultrasound they will give you an estimated due date. My son came 4 days before his.

Post # 4
400 posts
Helper bee
  • Wedding: April 2018

I would add about 2 weeks onto your ovulation date (calculations based on LMP tend to assume a 28 day cycle with ovulation around day 14 but obviously this often isn’t the case). So that would put you at just over 4 weeks?

This will be adjusted when you have a scan but will give you a rough estimate to work with in the meantime.


Post # 5
7720 posts
Bumble Beekeeper

How did you calculate your ovulation date? If you’re fairly confident that 7/28 was the date (as confirmed by OPKs, temping, or a program like Ava), you can plug it into the calculator here to figure out your projected due date:

But if you’re just guestimating ovulation based on your usual cycle it may not be reliable, as miscarriages tend to throw things off. Regardless, your doctor should schedule you for a dating ultrasound sometime in the first trimester, where they’ll measure the baby and tell you about how far along you are based on the measurements and calculate the due date based on that.


Post # 6
9536 posts
Buzzing Beekeeper
  • Wedding: July 2016

A dating scan will tell you how far along you are.  If you tell your doctor the situation they’ll generally agree to base your EDD of a dating scan done when they suspect you are at least 6 weeks.  Since you think you ovulated July 28, I’d push for the dating scan to be no earlier than 4 weeks after that date–basically any time in early September.


Post # 7
504 posts
Busy bee
  • Wedding: June 2017

This happened to me. Currently on week 14 of my pregnancy. My OB calculated my due date by miscarriage date (I also lost baby at week 5). Because of this I got an early ultrasound and that is when they were officially able to date my baby, so wait until then to know for sure. Based on our ultrasound the doctor was right in dating the pregnancy by my miscarriage. Good luck!

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