Can you be pregnant if you're on your period?

im only thirteen and me and my boyfriend(boyfriend) had *ex we have had *ex before we used a condom and it broke ? im on my period and I clearly dont know what do do ......... the second time we had *ex I think he broke my cherry ,and I dont know if it was my cherry or waht because that same day I started mty period I dont know if poping my cherry brought it on or something but how much of a risk is getting pregnant when your on your period ? I had safe *ex but im not on birth control or anything ? what should I do? I have no one to go to about it or anything because if I go to my grandmother she would kill me (she's the one im living with because my mom's in jail! ) but my boy friend said he dosent know what to do either? please help and reply I need some real help!!

no