Me and my boyfriend had sex and the condom broke before he ejaculated. Worried, we immediately went out and bought Plan B. I took the pill within the first hour after the sex. We had sex 3 days after my period. What is the pills effectiveness I'm trying to calm my nerves.
Plan B is more than 85% effective taken within 72 hours of having sex. Since you took it immediately it is even more so.
Remember, you can have side effects. Plan B can make your breasts tender or sore, you might have some spotting, your periods can be early or late AND they can be heavier or lighter than normal.
It is unlikely you are pregnant.
Hope it helps.