Hi, my husband and i have been ttc since april, we miscarried july 12th. We Were sexually active before and during ovulation. And i missed a period on august 18th. I have had several pregnancy symptoms; headaches, nausea, a little bit of cramping and constipation, sore breasts, and fatigue. However, i have taken 4 tests, all different brands, and they have all been negative. Whats going on?