Which birth control is the most effective for a female to prevent pregnancy from having unprotected sex?

Plan B. I assume that you are asking which pill can you take to prevent a pregnancy after just having had unprotected intercourse. If that is the case, and you are within 72 hours of sex (3 days), taking a single pill (plan b) is approx. 90% effective in preventing a pregnancy. There are other pill regimens as well. It is not going to be helpful if you are already pregnant. Good luck!

Related Questions

I am on a low dosage form of birth control for my cystic ance. So, can it still be effective to prevent pregnancy if I have unprotected sex?

As long as it's BC! Birth control pills are often used for non-contraceptive reasons. You will still benefit from their contraceptive effect. Of course, you must take the pills correctly without missing or taking them late. And, do remember that even though you are getting pregnancy protection, you do not get std protection from birth control pills. Lgromkomd. Read more...
Yes. As long as you take it daily. Remember, birth control pills do not protect you from getting diseases. You should still use condoms. Read more...

My gf and I had an unprotected sex for 3 consecutive weeks, she told me to ejaculate inside her. This week supposed to be her perioid. Can she still prevent pregnancy by taking birth control pills?

Too late. Her advice is exactly how to get pregnant. At this point, she either didn't conceive, in which case you will know when her period comes, or she did conceive, in which case taking bcps won't prevent the pregnancy. Starting the pill at this point will only complicate issues. She will be able to tell she is pregnant by waiting until a week after her missed period, and then a urine preg test will be +. Read more...