Possible early labor? Misdiagnosed Miscarriage?

So back in October I found out I was pregnant and then I miscarries at 6weeks. Well today is my due date and the past two days I have been having heavy discharge, lower abdominal cramps, hip pain, breast tenderness, nausea, and the poops. Since my miscarriage I have been trying to lose weight and instead I just kept steadily gaining and have gained 20 lbs and unable to lose any weight! All this being said a few days ago what I thought was my period ended up being a brownish mucusy discharge for 3 days straight! And now all of the above symptoms. I’m not sure what to think, my dr never continued testing my HCG to zero or ran another ultrasound. No I’m not ovulating and it’s not period cramps!