I've been having some major discomfort lately. I am having sharp, almost constant pain in both sides of the lower abdomen where the ovaries should be. There's usually just a tiny bit of vaginal discharge that is brownish coloured and smells a bit strange though not too strong. My abdomen is bloated and painful to the touch. A while ago I also had headaches and a bit of a temperature and my previous period came 10 days late and was lighter than I am used to. I am not sexually active but have been intimate with my boyfriend and I've started thinking I might be pregnant though it is practically impossible - out of precum and at that introduced into my body after some time through a finger  - hpt have been negative. What could it be? I have to get my period after 5-6 days but I am not feeling pms-y like usual as if it may not come at all. Abdominal ultrasound shows nothing - what should I do?