So I ovulated on thursday, the 5th of january, and today I was supposed to get my af, but I did not. I have a strict 28 day cycle, so my af is never late nor early, I took a pregnancy test and it was a BFN. I have also been having very very sore breasts. Could I still be pregnant? Is there any way my hcg level isnt high enough to show a positive? Please give opinions