pregnant before first period after miscarriage

i had a positive test nov. 10th....then on dec.25th i starting bleeding for 3 days. since then i was waiting for my next period..period hasnt come and now i have another positive pregnancy test as of jan.25th. im going to the dr. to see if im still pregnant from November or is this a new pregnacy. I have no symptoms yet either :/ ...Has this happened to anyone else.