Thanks for posting in a new thread. Sorry I couldn't respond to your several attempts to post your question as a comment in other threads. Because "thread jumping" diverts the discussion, it is unfair to the original questioner.
For what it is worth, in my 30+ years in the STD field, I only saw one patient (back in the 1980s) who was unlucky enough to catch an STD the first time he or she had sex. Most likely you aren't the second. Many young people grow up in today's world with an inflated notion of the STD/HIV risks associated with sex, and it sound like that applies to you. For example, heterosexually transmitted HIV is rare in the US, in the absence of bisexuality, drug use, and certain other high risk situations (which by and large don't apply to college students).
Most important, your risk of catching HIV or any STD probably was very low, based on your lack of typical STD symptoms, your negative test results, and your partner's sexual history. That said, her recent normal pap smear doesn't say much; but if that exam included STD tests in addition to the pap smear itself (as it usually does), then it probably offers still further reassurance that she didn't have anything for you to catch.
My advice is that from a strictly medical perspective, you don't need any further evaluation or testing. However, you would do well to speak with a knowledgeable health care provider about the real risks, safer sex, and the like. Such service probably is available at your institution's student health clinic, which in recent years have become excellent and generally very reliable sources of STD clinical care and prevention advice. Don't be embarrassed about it; trust me, they have heard it all before; and they hear stories more or less like yours all the time.
Bottom line: Relax, seek out reliable information, and don't lose sleep over this event. Good luck-- HHH, MD
PS: There. That was worth the $10 donation, wasn't it?
HHH, MD
-Blake