If had a full period on January 23,2018 that lasted until January 27, 2018, and then I took a plan b pill on February 5th. I took the plan b pill the next day after the situation. I took the pill less than 24 hours from the situation occurring. Then I bled for 3 days starting February 12, 2018 until February 15th. I stopped on the 15th of February. The bleeding came early and idk if it was because of the plan b or not. Idk if that was my period or not, because my period tracker said my period wasn't due until February 19th, 2018. But maybe the plan b pill made it come early so when is the right time to take a pregnancy test to know for sure I'm not pregnant???