Pregnant???

My SO and I both noticed my boobs have gotten bigger and more vains have been showing up. Also, I've been bloated and my boobs have been hurting for almost a week and a half now. BUT I just got off my period 2 weeks ago and usually don't start for a month. Andddd to top it off I tested negative on an at home pregnancy test and one at Planned Parenthood. Oh and when I got tested 3 or 4 days ago there, I also got on birth control for the first time ever. Basically I'm just so confused. I'm not supposed to start my period until the 26th and my boobs are never sore for this long. Heeeeelp