emergency contraception
"Okay so I had unprotected sex about 3 days into my period, 12th of Feb and then my period completely stopped. I took plan b about 3 hours after having sex and experienced some spotting but no other symptoms really. I had protected sex three times during I was waiting for my period. My period came over a month later. So I'd say 15th of March about and it's lighter than what I thought it would be. So ladies try not to panic it does work although I'm going to carry condoms and sort out my  contraception!"