Hello. On Yesterday While Sitting At My Computer At Home,

Hello. On yesterday while sitting at my computer at home, a gush of watery blood came out. I had on a dress so when I stood up the chair was wet almost like someone had thrown a cup of water in it. My dress and underwear had blood covered but i don't know how dark or light it was because my dress and panties were dark blue however, when I wiped it was brownish. I had polyp removal from my cervix on Oct 13. Could this be an early sign of pregnancy. I have 3 children but this hasn't happened before.