Pregnant through non-penetrative sexual activity

[Vextrion]

First off, I don't want to sound impatient and rude but I understand the implications of unsafe sexual activities. I've already researched for answers beforehand and have read numerous different answers but despite that, I'm looking for one that can give me a peace of mind. Also I understand that wearing protection is important and that non-penetrative sex IS POSSIBLE under certain conditions. And with that I will describe mine:

1) There was no penetration
2) No Ejaculation/nor pre-***
3) sexual activity as described was the rubbing of genitals for a few seconds outside the vagina, no longer than 15-20.

These CAN clearly result into pregnancy. Possible, but highly improbable as most people would say. But understanding that there is a chance, the peace of mind i'm looking for is:

HOW HIGH IS THE PROBABILITY OF GETTING PREGNANT THROUGH THE DESCRIBED ACTIVITY ABOVE?

I've been really stressed over this, and I'm naturally a paranoid person. There is always the "what if" thoughts circling around my mind. And the fact that we are not ready, nor are we expecting for pregnancy. I'd kindly respect that answers you give, and kindly ask to refrain from getting answers that are commonly expected from most people such as wear a condom and use contraceptives. I understand your concerns and the stupidity of our actions.

Also, contraceptives at this point are no longer an option. And obviously we shall also be taking pregnancy tests

But as early as now I would like to gain a feeling of relief. So any helpful answers would be appreciated, and any hurtful comments would also be respected :)

[Caryopteris]

If it's going to ruin your peace of mind, don't do it.  If you are going to do things that carry some risk,, then you need to be able to wait the few days it takes for a pregnancy test to be effective.  Those are the facts.  Asking people to speculate on your conundrum is not logical.  

[CRSeaside]

Dear Sir,
   Rest your mind .  Those sperm do not like to live long outside. Also that is a long way for a Precum, and we don't know if there were any, To Swim.
    Nobody is pregnant here.  Take it easy. Find other ways to deal with your compulsive personality.  Exercise is a great way to reduce stress.
    Have you been to a Therapist ? Or MD. Get checked out before starting any new exercise program.  Thanks for your Question. Pamela

[cng18]

HUFF ok here is what you do next tho if she is not on Birth control you obviously know my next line so i'll spare you BUT Pre ejaculation is more potent then when you really ejaculate if you put your penis inside the vagina then you have something to worry about if there was no penetration what so ever with your penis then with out a doubt she is not pregnant a good way to find out sooner then a month down the road is a blood test done by the DR they will be able to see a hormone change good luck and next time be smarter ^^