Missed period after taking Plan B. HELP!

Patient: The condom broke. I took plan b 8 hours after the accident that was feb. 21. After 2 days (feb 23), I had heavy bleeding like a normal period but I’m not sure if its my period because it only lasted for 2 days. On the month of march I missed my period. I took pregnancy test 3x on different days around april. Today (april 22) I still haven’t gotten my period yet. Please help. Thank you!!!

Symptoms: None