My period was not suppose to start until Aug 6th. I had unprotected sex with my hubby around time of my ovulation.

On the 25th August I started to have mild cramping on the right side of my ovary and then on the starting on the 29th of Aug I started having intermittent bleeding mostly only when I wipe it was first light pink when to dark brown then back to a reddish pink and today it is dark brown/red. It keeps coming and going cramping is very light and is also coming and going. I took 2 pregnancy test and both came back negative.

What can this be? We are trying to conceive and it took me 2 years with my first daughter I wish this would be it for me I'm trying to keep my hopes up but with every wipe it is so discouraging :-(