Oh, and to clarify, bumps do not necessarily mean that she has an std.
You should get tested. You do not know what her husband has been doing, nor do you know if you are the only other person she is having sex with. She also should be tested when she sees the doctor for her pregnancy. That would be automatic anyway.
i think the tingly feeling is normal man. go get tested. it shes pregnant im sure her vagina is going to feel odd, along with the rest of her body. while youre down there next time, look for bumps.
-l8r