Ladies I need your help !

Zee
So I had my period about 4 days ago ! My 4th day was just brown spotting and today is the 6th day I'm still spotting brown and a bit red! My breast are sore and huge my belly keeps growing every day I get fatigues all day at work I eat my ass off and I gained about 8lbs ! Everyone is asking me if I'm pregnant but I took a pregnancy test 3 weeks ago and it was negative !! I feel so weird though