Need help please..?

Cj
Okay ladies so in October I had a normal 6 day period that arrived on time and it was from the 7th to the 12th! I also had a SECOND period in October that started on the 25th to the 30th (normal 6 days) but its unusual for me to have two in one month! AF was suppose to arrive on November 21st.. I took a test that day and got a BFP and have taken 2 since and both positive! I was estimated to be 5 weeks as of today yet when I found out (Last Monday) I was estimated at 4 weeks 1 day.. I have my first prenatal check up tomorrow but need opinions if this has ever happened to anyone and if yall were further along than estimated in this situation! Thanks in advance! :)