Can I seriously be pregnant already?!

Miscarried dec. 4th haven’t gotten another period yet. Took a test Jan. 4th which came back negative. Took a digital on Jan. 5th, again negative. Still haven’t gotten a period so I decided to test again last night and got a positive test...

took another one this morning because I’m a little in denial I think but this one came back with a stronger positive.. can I really be pregnant already this soon after a miscarriage and no AF yet?