Ugh So Confused.... Anybody experience this?

Last AF was July 13th and it said I was due for my next AF August 10th which was a no show. I've had prego symptoms since August 1st but tested negative and I had a blood test done yesterday which I was just told was a negative so I'm just confused and now I don't know when my next fertile days are anymore or when I'll get my period. My body is usually predictable but I have no idea what's going on. Any ideas?