Pregnant right after miscarriage

I miscarried at about 6 weeks starting 12/30. Blood work had dropped to negative 1/1. Positive ovulation test on 16th. BFP 1/27! Clear blue weeks estimator says 3-4 weeks (i know they aren't super accurate). Any ideas on my due date? No period between miscarriage and BFP. Dr in March! Praying this baby sticks!