I would say you're fine, 2 hours is much too quick for anything to come on. Your exposure was low risk, a lot of people say oral is. Don't get me wrong, oral still spreads stds and some form of protection is always recommended (condoms, dental dams) for it. But when you really "crunch the numbers" your exposure was low risk. The bump on your toung is probably the same things we all get, and has probably been there all day but you're just noticing it now due to the paranoia. If you look hard enough while in the wrong mind set you can find ANYTHING. With the bump and line I'm going to assume you're worried about hsv?
I totally understand your concern but honestly you shouldn't worry at all herpes is very unlikely as herpes you find on the genitalia is usually hsv-2 which does not like the mouth very much, it's harder to transfer and if it is transferred it does not often break out on the flip side hsv-1, generally found on the mouth (cold sores) has been known to be on the genitals due to the influx in oral sex but does not break out or shed often at all so your chances of catching anything this would be very small. And that's IF she had it. You're real world risk is so small I wouldn't even worry, and trust me I do! Unless HIV is really common in the community, I wouldnt have even have thought about it.