Plan b works by delaying ovulation so if you have already ovulated then that ship has sailed. It can of course fail but if you take it within 72 hours after unprotected sex then you have a great chance of it working even better in your case since you took it a mere 5 hours after.

Morning After Pill I Still Got Pregnant Even Though I Took It

If your period doesnt show up by this time in march then you should do a pregnancy test.

Can plan b fail. One even if the pill does alter the endometrium the changes it causes have not been proven to hamper the implantation of a fertilized egg. A close friend of mine has a 17 month old after taking plan b so yes it can fail. Plan b is a huge blast of hormones designed to keep you from ovulating.

It even raises the counter intuitive but undocumented possibility that plan b used after ovulation might actually prevent the loss of at least some of the 40 of fertilized ova that ordinarily. You may have heard that taking emergency contraception like plan b during ovulation makes it less effective and unfortunately that s one rumor that s true more on that below. No as long as you take the pill within the first 24 hours you should be fine but a word of advice if you don t want to get pregnant get some birth control.

Try to stop worrying because that will affect your cycle too. Plan b one step is a brand of over the counter otc emergency contraception. It also will cause the same symptoms pregnancy does.

If it is negative then you will know it is just the plan b messing up your cycle. Answered may 8 2017 basically they will fail if you were ovulating on the day that you had sex or very soon after you had sex. Because it is most effective when taken as soon as possible up to 72 hours after.

But there are two things to keep in mind. You can use it as a backup if you suspect your birth control may have failed you missed taking a birth control pill. So the fda may have decided that because the pill may do this so can plan b.

Plan b one step can be purchased over the counter at drugstores without a prescription or proof of age. But all is not lost. Most likely you will be fine.