Okay so I lost my virginity July 17 at around 4-5 am. I was on my period while I had sex and we didn't use a condom but he pulled out. I stared to panic later during the day while I was at work so the day after July 18 at around 2 I went to Walmart to the pharmacy and bought the plan b pill. I'm still on my period now. I'm still kind of scared that I might be pregnant because my periods last only 4 day and I've had my period since July 15 and its jul 22 now. My periods never last this long. And I'm scared since I took the pill while I'm on my period it may not work. Please help.