Step parent adoption

I'm in a complicated situation.

I recently married and am pregnant with another man's baby. My husband knew when we started dating again the baby was in no way his but he accepted her as his own. There are two possible father's one who wants nothing to do with her and one who wants some part. I have had no support through the pregnancy except from my husband and parents. I have HG as well meaning iv medication every single day and lots of medical bills. My state automatically will put my husband on the birth certificate. Whay is the chance the biological father can get custody over my child. I am anxious it might just be hormones but neither of the biological father's are good people. Both with multiple drug charges.