Bleeding while pregnant ? Someone Answer ..?

I'm not compeltly sure if I'm pregnant , bc I bled for 4 to 5 days lighter than a normal period on the 8th of December it was a day early then my excepted period , mine are usually a lot heavier , I saw online something called ducidual bleeding , I've literally have had every sign of pregnancy , I get nauseous , my breast have literally grown a whole cup size , I'm moody and sad and all I wanna do is sleep , I've had this weird snot like discharge , sometimes it looks white or clear , I've never seen that before either ... I just don't know what's going on , I haven't tested yet ,