Ok is my Body Screwed up again or What? TMI

I don't know What is going on. Ever since we lost Zach and I started getting AF again she's been pretty much right on time. Which is Very unusual. I used to go month without her and then she'd show her ugly head. But now she's MIA and I don't know what is going on. AF was due July 26th give or take a day. But nope she's not here. I did spot a tiny amount one day but that was It! I hate to think that my body is screwing up again.
I broke down last week and took a Pregnancy test but it was Neg. I Really didn't figure I was preg due to the fact I only have 1 ovary and we used protection. But still No AF. Arrgghh! I know most women would love for AF to stay away but Man I want her here! NOw!