Hey, what matters is not whether it's bothersome or not, but whether you are getting the help you need to deal with these worries.
As someone with a little experience with OCD stuff myself, I'd guess that right now, a bit of your mind probably already knows that the answer I'm about to give is nope, you don't have a pregnancy risk.
You've asked a few times before about people's hands touching your hips or legs, and the answer is still no, there is not even the tiniest bit of a pregnancy risk there.
Guys don't just walk round with fresh sperm dripping from their hands, and even if they did that sperm could not crawl through your clothes and climb up your leg.
And nope, unless you're having direct genital contact in the swimming pool, there's not going to be a pregnancy risk.
Check out: http://www.teenwire.com/index.asp?taStrona=http://www.teenwire.com/ask/articles/as_20011108p310.asp .
Really, unless you're actually engaged in sexual activities, you just don't need to worry about pregnancy.
If you have OCD, I understand that you're not going to be able to stop yourself from having these irrational worries just by willing it or by recognizing that they're irrational (although that can be a step in the right direction).
Have you managed to talk to your therapist about your pregnancy fears yet? It might also be a good idea to talk about medication as a possibility - OCD often responds really well to medication, and it seems clear that this is causing you a lot of stress.