What Could Cause Nausea, Vaginal Discharge, Headache, Heavy And Tender Breasts Along With Darker Nipples?

I have pregnancy signs, I feel nauseous, heavy and tender breasts with darker nipples, I have a vaginal discharge and headaches there and there, I did 3 home pregnancy tests which came negative, a scan and blood tests, all negative, I have a sensation in my lower abdomen, What could this mean