Hi, I have been having unprotected sex for the past 3 months now. My periods are never regular. I have been experiencing constant nausea , extreme fatigue and headaches. I have done a few pregnancy tests , one of which was positive, I now have bleeding but don t know whether it is my period as I suffer with dysmenorrhea and have not had any pain and the last test says negative. I have been pregnant before and I recognise the symptoms. What could be happening?