my boyfriend and i had unprotected anal sex a week ago (Saturday , Feb 25. 2017) and he said he a had little bit of precum (i heard you can get pregnant if you masturbate before having sex w just precum) and i know you can't get preg from anal but sperm can get somehow into the vagina is what i looked up. so i was really scared so we got Plan B the next day at night about 30 hours later ? (Sunday, Feb 26. 2017) ever since i've been having side effects of breast tenderness one day then slight bit of cramps in the first few days. but now it's (Sat Mar. 4, 2017) and i'm still experiencing side effects. Bleeding and mild cramps with a little bit of back pain. how long are these supposed to last? i'm supposed to have my period right now or sometime soon. i'm just confused if its my period or plan b? also i'm not wanting to eat as much, lower back pain, nausea, (the cramping comes and goes , one side to another) pms, plan b, or pregnancy? im just so confused, scared, and stressed if i am pregnant or not? i'm only in high school :'(