I had a couple friends in college who were "born again virgins".. they had sex, but then decided not to again until they were maried (to whomever that ended up being). I thought that was sort of weird, but it was because of their new religious beliefs, so understandable.
If it's just because you feel guilty, i agree with some of the previous statements. I don't see how not doing if for 3 months is going to change anything. If I ever get married I'm wearing a fire engine red dress anyway.