You can also get syphilis if she has it orally.
Seriously, the best way to find out if you have an std is to just test.
AJ
You can get several STDs from receiving oral sex:
Herpes
Gonnorhea
Other Bacterial Infections from mouth bacteria
Herpes would typically occur if she had a cold sore. However, on the rare occasion she could transmit it without a cold sore. If you already have cold sores, then you would be largely immune.
You would not be able to tell with the other two. Infection would be rare. However, they are readily curable with the right antibiotics.
if the girl have std and she do not know you can get it
how exactly can I watch for herpes? Is there anyway I can tell if a girl has herpes? What are the side effects of having herpes?