How long after having unprotected sex is it safe to start taking an antibiotic?

HiI always see questions asking how long after taking an antibiotic can you have unprotected sex again. But what If I had unprotected sex last night and was just prescribed an antibiotic that said it may affect the effectiveness of birth control. When is it safe to start taking the antibiotic with no risk of pregnancy?

ask a doctor. dont take any advice you find here. seriously, unless you want to get pregnant by accident...

use condoms

my pharmacist said that's a myth, but he looked kinda cooked lol

or just use a condom for a week.
it wont kill you

You can't get your asshole pregnant!

waz666 said:

You can't get your asshole pregnant!

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lol way TMI

sperm stay viable and searching for the egg for up to a week. wait a week and a half just to be sure.

BigTitLvr said:

sperm stay viable and searching for the egg for up to a week. wait a week and a half just to be sure.

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no way! Sperm die so quick. And only the strongest make it through th egg. The average is 22 hours after insemination, and the mode is 24 hours, with a span of 1.5 up to 72 hours at most.

But anyways, go ask a doctor. Or go to a free health clinic, where they test for HIV (they'll test you for std's and answer your questions for free, at least mine was free cuz i was a student only making below a certain amount) If you cant afford it, do you know any doctors, within the family or friends, that you can call for advice? My uncles a doc and I call him rarely if I need his expertise.

I agree that the only advice to accept here is "Talk to a doctor".

Do you really want to take a chance that you follow advice from someone that believes in witches and psychics?

Agreed. Talk to your doctor because it's too important to fuck up. But I actually did talk to our Doctor when the misses and I were trying to get knocked up. She told me sperm live in the female's body for up to a week. That's a maximum, not an average.
Question

Sperm: How long do they live after ejaculation?

How long do sperm live after ejaculation?

Answer

from Roger W. Harms, M.D.

The life span of sperm after they're ejaculated depends on the environmental conditions. Sperm ejaculated into a woman's vagina remain alive in the mucus of the cervix and are able to fertilize an egg for three to five days. Sperm ejaculated outside the body usually live only a few hours.

Wiki answers 3-5 days. I'd count on a week, just to be sure.

If the girl is on top when a man ejaculates, it all runs back into him and he will get pregnant.

maybe not.