I'd really appreciate a bit of input on the subject since I'm a little worried that I could be pregnant

I was with my boyfriend about 6 or 7 days after the beginning of my period (a month ago) and we were messing around a bit... he had boxers on but I had nothing... I know for sure he didn't but is der any chance that any of his pre- could have gotten in me?. we only messed around for like 10 minutes... its just that my last period which was around a day ago wasent that bad... I have been away from home for the past 2 weeks and my diet has changed extremely plus I did take a bit of pain relief for my period so could that have had any effect?. also my period is pretty regular... I'd really appreciate the help... thanks

There is a slim chance that you are pregnant. But, if you want to know, take a test.

It is unlikely you are pregnant considering what you described. Extreme changes in diet might have caused a change in your cycle, taking the pain meds won't. How regular is "pretty regular"? Maybe it is just off this time around. See what happens in the next week or so, and if you have been at all irregular in the past, wait and see what happens next month. Be careful in the future with messing around... just to be on the safe side.