Odd symptoms. Tmi


So my last cycle started on June 26th and lasted until July 13th. I haven't had a cycle since. The last three or so weeks I've had terrible morning sickness, my breast are sore, I'm constantly nauseous, and my lower stomach feels tight and seems to have swelling that is slightly more this week than last. I've taken several pregnancy test and they are negative as well as a blood test. Could I still be pregnant?