Male here. Had unprotected oral sex with new gf. She had sex partners before; I haven't. Her STD status unknown. I'm scared of STDs! Advice?

Some thoughts... How is a guy who fears STD's going to manage sexual activities with a new girl who's had other partners? Possible choices: do not engage in sexual activities until after the wedding (yes, it is normal not to have premarital sexual activities); go with her to her doctor to get her checked and to review test results; have sex, be scared, but get oneself checked each month for 4 consecutive months.