breastfeeding mommas

anyone on the mini pill ? i never get a period but i have been having cramping for the past week & a half (i usually get it towards the ends of my last week of pills) & is this normal ? i'm 99.9% sure i'm not pregnant because last time we had sex we used a condom & that was like 4 weeks ago ! & checked to make sure it didn't break ! i know breastfeeding cause put a hold on periods , but could mine be trying to come back ?