Confused..

So i had a chemical miscarriage November 10,2018...Stopped bleeding on the 14th..but I was still getting positive pregnancy test. I went to my gyno she said I had a m/c...pregnancy signs started disappearing..We did the deed on the 16 and 17..Suddenly on the December 1,2018 I feel nauseous whole day but I'm on metformin so I think probably that caused the feeling..December 2,I'm an emotional wreck..December 3, my boobs start hurting..December 4 positive pregnancy test but Im confused.And I can't brush my teeth without gagging or throwing up...I don't know if its a new pregnancy or hormones from the old one. Af is to arrive on December 6..Cervix feels mid way..Last time I was pregnant I could hardly feel it...