thanks for the comment
had a feeling that was the case also
I wouldn't recommend using the antibacterial soap - sometimes it can be irritating and cause more harm than good. If you are concerned about STD, rest assured that 2-3 hours is far too soon for STD symptoms to appear. A pain that "comes and goes" could be from anxiety, which can magnify normal body sensations. Oral sex is generally low risk for STD transmission. However, if you are going to remain concerned, you and your girlfriend could always get tested - it would clear everything up.
Good luck,
Em