Im confused about my cycle could i be pregnant and not know it?

Ok the last time I had was with my ex husband like in April of this year. I took a test like the day I left him to make sure I wasn't prego so I'm divorced now and I had two light colored periods like pinkish redish and its normally a darker red. And now I'm past due for my third period and its Nothing coming. Now I have wet discharge that's watery and sticky. Been having a high libedo too. I can't loose weight either. I walked all over town all week and my legs just got bigger. Btw my great aunt had a period for the first five months of her pregnancy. Could that type of thing be hereditary? Oh and the test I took was negative. My last period started June 12th and its July 27th so I'm two weeks late.