Hi, I had protected sex 2 days after my

Patient: Hi, I had protected sex 2 days after my period ended in Jan this year. My partner checked the condom and it was not broken. Since then, I have had 3 normal periods ( heavy and painful as I have fibroids)however this month ( May) my period is 8 days late. I have not any sex since Jan. What could be the problem?

Doctor: