Any insights?

Ok, I'm regular. I've been tracking my period for years and I'm always 29-33 days. My last period was May 15-19. Ovulated around the 30th. Had the sexy time once on the 28th and again on the 29th. We are trying to have a second for one year, if it doesn't happen by next August when I turn 40 then he's getting snipped. This is the first month we 'tried'- not really but we didn't use protection. Period was expected on the 13th- the day came and went and nothing. Nada. Sex again on the 14th (honestly hoping to loosen things up haha). Still nothing. From about the 10th on I've been cramping, this past weekend my breast got tender, yesterday and today they were crazy tender. Today I went to the bathroom and saw blood, fresh red blood- yay, I got my period! Well about an hour later it turned brown and dwindled to nothing over the course of the day. Now it's gone. I've taken probably 10 tests, all BFN. Could I possibly have ovulated late and really am pregnant now, or is this some twisted pre menopause trick? I miss my reliable body!!!