AF is 9 days late, I've taken 2 pregnancy test. 1st on on the 2nd day of my missed period and 2nd one on my 6th day late, both were negative. What do you think it could be? Do you think I am pregnant but hpt just not showing it?

(BTW: me and my bf don't use protection and he cums inside me sometimes, last period was June 21, I'm on CD 40, my bf came inside me on 4th of July which was one of my ovulation days.)