question: Hi I have a very regular period i start every month around the 16-18 and end 5 days later. This month i started on the 16 and ended on the 21. I had unprotected sex the same day i ended my period. i was concerned about it so on the 24 i took plan b just in case. now i have had what i thought was my period coming early but it only lasted a few hours and the blood was bright red almost orange. could i be pregnant?