How long does Plan B "screw up" your system.

Kennedy • TTC? 18, HS graduate and almost done with college. Been with my bf for 3 years <3
I had sex the Thursday before last with protection, then last Thursday, Friday, and Saturday. Saturday the condom broke. This was before we decided we wanted to conceive. I took plan b. Haven't gotten my period yet and it's been a week since I took plan b. I feel cramps and they are normal period cramps but no spotting or regular menstrual blood. Should I try to conceive tomorrow morning? Do you think I'm ovulating? My last period was March 7-12. I'm supposed to not have another for 17 days. However taking Plan B I think it screwed up my womanly system. What do you think I should do? Try tomorrow? Or wait until after this period?