Plan b?? PLEASE HELP

Is it okay to take plan b more than once? Things happen and we just get into things so my husband had to buy me plan b 4 times so far this year. Will taking it this much be okay? Also i’m close to the end of my period, is it okay to take it while on my period? And i take a medicine called “goody pms” to fall asleep at night sometimes and this is one of those nights i need it, can i mix these medicines? Sorry for all the questions. I really appreciate everyone’s feedback!