Im 21 and had my period around 2-3 weeks ago the on the week after my period i had sex with my friend using a condom i dont no if it broke or not, i dont take the pill or anything and with my boyfriend for the last 7 months and we dont use anything he just usually pulls out. then i had my period again but only lasted 3 days whereas it usually lasts 6-7 days least now my breats are score and tender to touch, what could this mean.