Odds of conception BEFORE O vs. Day of O?

Dori722 · January 2011

Just curious if anyone knows the stats on this.

For example, if you had sex 3 times in your "fertile week" prior to O but on another cycle you just had sex 1 time but it was the day of O, are you always most likely to get pregnant on day of O?

I realize this could be a dumb question b/c I know the odds are better the closer to O - but lets be honest, it would be pretty impressive if 90% of couples who conceived, did so on the day OF O. That's only 1 day a month!

anyway, just curious if anyone read the statistics?

HappyAardvark · January 2011

That's probably nearly impossible to determine with any reliable degree of accuracy, since most couples TTC have sex more than one day in the peak fertile period, and it would be impossible to tell which "session" led to conception - i.e., the sex from O day, or the sex from the day before. Interesting though if they could somehow figure it out.

alison2379 · January 2011

This is just a total guess, but I'd imagine that sex the day BEFORE O is actually more effective. I have O pains, so say I feel them in the morning, and I'm ovulating then. If we have sex late that evening after I ovulated, there's a chance my egg died off, right? But if the sperm are already waiting there from sex the day before, that's good, right?

I could be totally off base, this has absolutely no medical substance behind it and is just me thinking out loud. In an ideal world, you'd have sex *both* days.

JMay · January 2011

Hardly impossible to find out - that's what volunteer-participant research is for. To control for these very variables.

My best guess, given information I've read, is that your chances are greater (sorry, no percentage) in the days prior to ovulation, as the window of opportunity is larger (a few days) versus on the day of ovulation, when the sperm only have a short window (< 24hours) before the egg disintegrates.

I would also be very interested in official stats if anyone has them...

Lambie. · January 2011

There was a chart I saw last time we were ttc that had probability of conception based on day of intercourse. The two days before o were the best and the day of was pretty low.

Lambie. · January 2011

Yep, that was it.

jillybean1012 · January 2011

kdodge423:
Lambie.:
There was a chart I saw last time we were ttc that had probability of conception based on day of intercourse. The two days before o were the best and the day of was pretty low.
Was it this one by chance?

And before someone asks, no you do not add the percentages. You average them. If you hit all 5 days, you have a 17% chance, which is right in line with the 20% that often gets cited.

Thanks for posting this - its very helpful.

funkymonkeyohyeahhh · January 2011

There was a recent thread about this on GP with a link to a few different studies/charts, if anyone wants further reading.

https://community.thenest.com/cs/ks/forums/thread/47842232.aspx

prplscrubs · January 2011

alison2379:

This is just a total guess, but I'd imagine that sex the day BEFORE O is actually more effective. I have O pains, so say I feel them in the morning, and I'm ovulating then. If we have sex late that evening after I ovulated, there's a chance my egg died off, right? But if the sperm are already waiting there from sex the day before, that's good, right?

I could be totally off base, this has absolutely no medical substance behind it and is just me thinking out loud. In an ideal world, you'd have sex *both* days.

this is what I was thinking exactly.. I also think that I have read this somewhere too... not sure where, maybe FF?

Odds of conception BEFORE O vs. Day of O?

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