can I take the plan b pill after 4 days?

You should take the pill the day you've relized you've made a mistake for every day you wait it decreases your chance of actually working . Taking it the same day you only get a 95% chance of it working the second day 65% and the third is only 42% taking it the forth day would be useless sorry. Try not to worry about it, wait till your period comes, the more stress you put yourself through the longer your period will stay away. If it doesn't come on the right time take a test to make sure

No- must be taken within 72 Hours ( 3 Days)

When should I take Plan B One-Step®?

You only have a few days to prevent pregnancy after unprotected sex or birth control failure. Plan B One-Step® works better the sooner you take it.

It must be taken within 72 hours (3 days) of unprotected sex.

It's only one pill, so you can get what you need right away

- taken within 72 hours (3 days) after unprotected sex or birth control failure.

http://planbonestep.com/faqs.aspx

it could, but there is definitely a decreased chance of it being effective. are you in a position where you would be able to see a doctor quickly? if so, they can write you a prescription for ella, which is like plan b, but can be taken up to five days after intercourse.

good luck!! ")