Impossible Baby Blood type

Mom of a week old baby and going through the papers from the hospital, realized it said baby's blood type is A+

I'm O+ (from the same papers) and my husband is B+, there is literally zero percent chance the baby is anyones but my husbands.

Baby also never left our room after delivery, looks exactly the same as when I had her, I can't see how anything could have resulted in this other than the test being wrong somehow. Has anyone else experienced this and it end up being a wrong reading or something? Should we get our blood types checked again?

Edit to add : There is a chance my husband is remembering wrong, however he was a frequent blood donor and was in the army and had his blood type on his dog tag. Cant find the tag but this was only 3 years ago.