Unprotected sex a couple of days before period?

[misfit4leaf.livejournal.com]

A frantic friend of mine wants to know:

She had unprotected sex about two days before the start of her period. She hasn't actually missed a period yet, but I told her I'd ask this fabulous community. The guy never came inside her. What do you think the odds are? I've tried assuring her but she won't listen to me.

Comments

[musicgirl312.livejournal.com]

I apologize if this is a dumb question, but would PlanB likely do any good, even if taken right after the incident? As I understand it, the only PROVEN effect of PlanB is to prevent an ovulation from occurring, and if the unprotected sex in question happened 2 days before the girl's period, she's almost certainly ovulated, no?

[brightflight.livejournal.com]

Well, there is the (possible/likely) benefit of the thickening of cervical mucous to further discourage insemination. I believe it also discourages attachment of an egg or fertilized zygote to the lining of your uterus.

Also, ovaries get up to funny business––I know mine do. I honestly would not trust them farther than I could throw them. I've had a completely ridiculous menstrual cycle since I was 11.

[musicgirl312.livejournal.com]

From what I've read in the community recently, I was under the impression that the "stops implantation" effect of PlanB had come into serious question and that there's now a decent chance that it DOESN'T. As far as cervical mucous goes, I am unsure.

And yes, I agree that ovaries can be wacky, but most women most cycles will be non-fertile by 2 days from the end of their cycle.

[queensugar.livejournal.com]

Yep yep -- I can't get the link now for some reason (the Vulvapedia isn't loading for me), but there's a link in the EC Vulvapedia to a Princeton article that states that Plan B does not appear to prevent implantation of a fertilized egg.

[archangelbeth]

Almost certainly ovulated, and long enough ago that the ova is no longer viable, yes. The Plan B would be to eliminate the chance of a freak ovulation, or in case stress had pushed the date of ovulation waaaaay out of whack.

[http://users.livejournal.com/_crystalmyth/]

She would have ovulated, but you're only fertile for a few days. Once the egg is released from the fallopian tube down into the uterus, it's not able to be fertilized.

Women usually aren't fertile in the days leading up to their period.