I empathize with you for worrying about reactivation after stopping treatment. Continued monitoring after stopping treatment is a vital recommendation. Here is a link from the Hepatitis B Foundation on this matter: https://www.hepb.org/treatment-and-management/pregnancy-and-hbv/treatment-during-pregnancy/
This chart will also help explain things further, as used in a previous discussion on this platform:
High viral load during pregnancy - when to start medication
You can share this chart with your doctor during the discussion process. I understand this is worrying, but maybe you can concentrate on the treatment right now, then have this discussion of whether to stop or continue treatment after delivery. This way, you do not add any stress to your current condition. I hope this makes sense to you and it helps. Best, Bansah1.