Maybe pregnant?

[ChickenNug]

I had unprotected sex on August 17th and had a very light period on the 24th through the 27th. I took one early pregnancy test that was negative. I think I may be pregnant because for about 2 months I was feeling nauseous everyday I had frequent mood swings as well as tender breasts and fatigue. My breasts are still tender and my nipples seem to be getting bigger my stomach is also extremely bloated and I've gained about 15 pounds I've had vaginal discharge and have been constipated a lot lately. I'm looking to get someone else's opinion. Thank you.