Roughly 2 weeks ago I spotted a very light spot of blood in my discharge when I wiped and it was only once. Recently, I have been feeling quite nauseous but no vomiting, and it only seems to get stronger that I feel eventually I am going to throw up. My libido is decreased and when I did try have sex my stomach just felt weird. I had a child 3+ years ago and I have forgotten what I experienced. My period is due in 1 week and I have taken tests but they have been negative. Could I possibly be pregnant ?