So on the 13th of september me and my boyfriend had sex, although it was protected the condom popped and he basically nutted in me. i took a plan b the very next morning, i wasn't ovulating at the time according to my apps ( Flo and <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> ) .. but a website with a <a href="https://play.google.com/store/apps/details?id=com.glow.android">ovulation calendar</a> did tell me i was ovulating on the 13th.. could the plan b have possibly worked ? i'm expecting my period on the 21st of september.. i have bad headaches, and i'm blotted to the point where i look like i'm pregnant but i know it's way to early for any physical signs of pregnancy, i'm just really scared and paranoid