Confused on dates

posted 5 months ago in Pregnancy
Post # 2
Member
9846 posts
Buzzing Beekeeper
  • Wedding: City, State

You go by your last period – that is how your doctor will go. 

Post # 3
Member
604 posts
Busy bee
  • Wedding: September 2012

Agree that your doctor will go by last period date (unless ultrasound shows way off from that date), but if you want a better date just to know in your head – go by ovulation date.  Implantation date means nothing.  You’re tracking the age of the fertilized egg, it doesn’t matter when it implants.

Post # 4
Member
7915 posts
Bumble Beekeeper

naatalies :  as PP says the doc will go by your last period unless the dating scan shows otherwise. Whether the due date is the 22nd or the 24th really doesn’t matter in the grand scheme – that kid can safely come out anywhere from 36-42 weeks! Congrats!

Post # 5
Member
604 posts
Busy bee
  • Wedding: September 2012

naatalies :  PS come join us on the January 2020 babies thread!  We have a super active FB page too!  🙂

Post # 6
Member
6372 posts
Bee Keeper
  • Wedding: September 2015

My midwife group went off my LMP with an average 25-day cycle, which aligned with my ovulation date prediction.

Post # 7
Member
6447 posts
Bee Keeper
  • Wedding: February 1997

The difference of a few days – even a week – really is no difference at all. Your dr. will go off the date of your last period unless there is compelling evidence not to. And as PPs have said, the baby is generally safe to be born anytime after 38 weeks. The actual dates of ovulation and implantation just aren’t that relevant.

Post # 8
Member
7002 posts
Busy Beekeeper
  • Wedding: September 2012

Your doctor will go by your LMP. I also charted/tracked and logged each time we had sex. Due to busy schedules and how limited we did it that month I knew exactly when it was. My OB had a due date that was way off (later) of what I had in my head already. My baby ended up being born 10 days prior to their predicted due date . Either way those few days don’t make a difference.

Post # 9
Member
6444 posts
Bee Keeper

The doctor will go by LMP and then use the 8 week ultrasound to adjust the dates if necessary.  My doctor will adjust if it goes over/under a week.

Post # 10
Member
7915 posts
Bumble Beekeeper

I’ll just throw out there too that my midwife considered moving my due-date based on my measurements until I reminded her I did IVF so even measurements aren’t an exact science. Although she ended up being right – I always measured “ahead” and my kid came 2.5 weeks early! Some babies just cook faster I guess lol. 

Post # 11
Member
1830 posts
Buzzing bee
  • Wedding: July 2015

I’m probably terrible for this, but for my 3rd pregnancy I told my doctor that my period was two weeks before I knew I ovulated.  I was tired of always being told I was measuring behind in my first pregnancies, when I knew I ovulated late.  They will eventually go by the first scan anyway.

Post # 12
Member
351 posts
Helper bee
  • Wedding: May 2014

If you tell your doctor about your ovulation date and temping, they may do an earlier ultrasound to date the pregnancy. If they aren’t willing to, I would honestly get a new doctor. I don’t know why so many people are willing to accept the due date being based on the LMP when they know otherwise. You have a choice in your care. If you don’t feel like you do, you need new care providers.

Post # 13
Member
1851 posts
Buzzing bee
  • Wedding: December 2017

I subtracted two weeks from my ovulation date and told the doctor that’s when my lmp was.  That’s the most accurate date. But as others have said, baby will come when baby is ready – not at 40weeks on the dot.

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