period and ttc

So I haven't had like a real period since May 9th 2016 but then August 23 I had sex with my husband and after I had this light light blood only during that time when I went pee after that nothing. Pregnancy test say not pregnant could that have been a type of period? I'm supposed to be ovulating today and I have been having cm. so I had sex today. But could this have been a period?