Need advice

I am 16 and just found out I was pregnant. I am in foster care, and my foster parents are adopting me as soon as social workers get the paperwork done and set a court date. That could be awhile though. Im afraid to tell anybody, because of the fact I dont know what my social worker will do. Will he still let me get adopted? Can he keep me from getting adopted because I am pregnant? Could he put me in a group home for pregnant teens? I want to tell my foster parents and social worker because I need to go to the doctor about this. But im stressed out it's going to affect my adoption and my placement :/ does anybody know anything about any of this?