Blood test: Not bio dad

Jenny learnt about blood group at biology class so she looked up the blood group of her parents: yours is O-, Jenny's is B+, making it impossible for you to be her bio dad. Your wife Becky (A+ blood group) is terrified that her affair with Shawn, the true dad of Jenny, would be revealed, w/ Becky insisting that the medical clinic that drew the blood was substandard and made lots of errors. Jenny insists that she always has suspicion that you aren't her real dad given that she looks nothing like you, while Becky is lying that Jenny's ears look exactly like yours. Will you reassure Jenny that the labs are wrong, just like her mom says? Or do you feel like Becky is being unfaithful behind your back?