Please give advice

This is killing me mentally and I need help advice from anyone at this point . So last month condom broke and I took a plan b March 12 and my period finally came March 27 and I had a pregnancy test done April which came out negative! Now after prom I had sex with a condom now hole or anything April 15 and I still haven’t had a period yet I know plan b can mess you up but has someone gone through this ? Can something make my period come on ? Btw ( before I took the plan b March 12 I just got off of birth control pills February 26) but anyone give me advice? It’s really draining me out and graduation is almost here . Advice please