took plan b and now i’m feeling weird

i took a plan b 5 days ago and my period was supposed to be here yesterday and it’s not. i had sex but i used a condom and it didn’t break. my periods are always on time and now i’m thinking i shouldn’t have taken it but when i took the plan b i only bled for an hour or two and i’m scared that it’s implantation bleeding and i’m pregnant. i’ve only had sex two times and we’ve used a condom that didn’t break or tear either times, and idk why my period is late. i keep getting cramps but no period.