This is my post from the 22nd

A few days after this I took two clear blue tests and both came back negative. I took more of the Amazon tests (I did relook at the reviews and some people said many of the tests in the box were false negatives) but again all came back negative. I’m feeling very confused right now. As stated I had unprotected sex on the 22nd last month so I feel like if I was pregnant from that I would’ve already tested positive but I am now 13 days late for my period. Should I just keep testing?