I don't know about the risk of you getting pregnant... I mean it is a small possibility that sperm could have come inside you and if it does, then it is always a small risk of getting pregnant.
The sperm can survive up to 4 days in the vagina, only if you are close to ovulation. If you are not ovulating at the time, the sperms can't survive very long. Something to do with PH I think or something like that.
I think that you could be quite safe to think that you are not pregnant, but you just never know. Go to 'family planning' and ask them to do a test in a few weeks time. Cause if you do a test now, it will not be able to tell. In a few weeks your body will produce the hormones that will show up pos. on the test in case you are preg.
Please don't worry... I am crossing my fingers for you....
If by all means you are preg. have you thought of what you would do?