So confused and defeated

Megan

So I spotted for one day on June 3rd and thought it was implantation bleeding but all pregnancies test came back negative. My OBGYN thinks that one day I spotted was my period just a very very light one. That means I should have started this months on July 1st but I have not yet. I haven't tested either and I dont think I ovulate just bc I didnt have any of the symptoms. What in the world??? Ideas, opinions please