False positive hep b

Hey moms has anyone had a false positive hep b test? I have only been with my husband for the past 6 years and he’s only been with me. We spend all of our Time together and he’s never given me a reason not to trust him. We got blood work done at my 11 week appointment and they told me my hep b was positive but it was negative 3 years ago with my son. The nurse did tell me false positives are fairly common in pregnant women and people who have autoimmune I have SLE lupus and just coming out of a flair. I’m getting more blood work done Monday just wanted to hear from other moms on experiences.

TIA💕

*edit to add I have also had all three rounds of the vaccine I had to have it to go to school