No period, negative test...did I ovulate late?

Mary898
I am 4 days late and took 2 tests and both were negative. I have super regular periods 28 days and it always comes on time! 
We had sex during my ovulation which is 14 days before my expected period 8/9 and a 7-9 days before the period. (I am thinking I ovulated that day) I still have no period and doesn't feel like its coming. No symptome except feeling bloated and little cramps in my ovary. I went for blood test today and I have to wait till next Monday! :( 
What do you ladies think? Have you experienced any similar situation?