We had sex, and during sex the condom broke. We didn't realize until he had already ejaculated about half way in me and he pulled out. I took the plan b pill about 12-24 hours later. 3 days later I showed a side effect to the pill. My period 2 months ago was on day 18 and last month was day 12. Last month was the first month in about a year my period didn't land on the 18th. I haven't had my period yet, and I'm freaking out. Am I safe since I showed a side effect to the pill?