Gave oral 2 days ago (not deep). white stuff on tonsils, no blisters, no pain, no bumps. Not much discomfort swallowing. STD? Thrush? I'm very scared

Have MD look. Have a MD look inside your throat to see if there is a problem or not. It will relieve your concerns when you do. If necessary a swab and/or culture can be done to determine what is going on.