So 3 weeks ago, on the last day of my period my partner and I had sex unprotected. I took plan b the next day. The following day we had sex again and I took the pill again - I know. Stupid. I had bleeding 3 days later which lasted 5 days. The past 2 days I've been taking vitamin c, however for the past 4 days I've had so much pain in my uterus and it shoots down my legs. I don't know what's going on or what to do...please help.