Late period…

Heyyy….my period is 9 days late, today makes the 9th day. My period is typically regular, and even when my period is late it’s usually only a few days late. I took 2 pregnancy tests, and they both came out negative. I took one today and yesterday, both negative. So I don’t know what the issue could be with my period being this late. I have had sex a few times since my last period, 3 times. The 3 times we DID it we used protection, we used condoms. I know that a false positive could happen, it’s really rare but possible, but I took 2 tests and they both came out negative. Any advice you lovely laties could give would be grateful appreciated. Again I had sax a few times sense my last period but used protection each time, and took 2 pregnancy tests 1 day apart, today and yesterday and both was negative…. HELP lol??? I don’t know what could be the reason for my period be this late, is it possible I could still be pregnant even though I used protection and took 2 pregnancy tests which both came out negative. Also I’ve never had a missed period!!! Advice, suggestions, any help!!!