(Closed) Ovulation date vs Conception date?

posted 6 years ago in TTC
Post # 3
Member
306 posts
Helper bee
  • Wedding: May 2013
Post # 5
Member
607 posts
Busy bee
  • Wedding: October 2010

@QBbride:  I’ve always wondered this too. I don’t know the answer, but I do know that going based on ovulation and/or conception would be a lot more accurate than LMP for someone with irregular cycles. Watching this space…

Post # 6
Member
924 posts
Busy bee
  • Wedding: January 2013

I would say that conception would have to take place 12-24 hours after ovulation, possibly as long as 36-48.  The reason is that the egg typically only survives for that length of time.  Sperm can live for up to 5 days or so which is why you typically have a week to nine days of fertile time during a cycle (3-5 days prior to ovulation, ovulation day, and maybe the day after).  However, conception won’t take place until after the egg is released, hence ovulation day or the day after.

Post # 8
Member
9057 posts
Buzzing Beekeeper
  • Wedding: June 2010

@Sugaree:  Agreed.  Eggs typically live about 24 hours, so ovulation day and conception day are usually pretty close together if not the same day.

Post # 9
Member
163 posts
Blushing bee

Conception usually occurs 12-24 hours after ovulation. I got this info from medical textbooks.

Post # 10
Member
5109 posts
Bee Keeper

@QBbride:  Yeah, I’d say it happens so quickly that they consider it the same day. I see that on EDD calculators as well. I use FF who calculates EDD’s each cycle from day of conception based on my O date, and it’s always very close.

Post # 12
Member
5109 posts
Bee Keeper

@QBbride:  If you tell them that you think you are irregularly O’ing, they may be more inclined to do a dating one =) GL!

Post # 13
Member
1432 posts
Bumble bee

I’ve always been confused by this too. Also…” I always hear I’m 4 weeks pregnant, or I’m 6 weeks” when people first find out but I never hear “I’m 2 weeks” which is normal amount of time from ovulaton to missed period though right?

Post # 14
Member
924 posts
Busy bee
  • Wedding: January 2013

@mrs.stormylove:  Pregnancy is typically dated from LMP.  It’s just a convention that is used.  So being two weeks pregnant is basically within a few days of conception depending on what day you ovulate.  Most women don’t know they are pregnant at “two weeks.”  And being “one week pregnant” isn’t actually possible.

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