Ok so first of all, I have ocd, which means that I'm normally very health conscious and a to be honest, a bit of a hypochondriac...anyway, while I es on the last day or two of my period and me and my boyfriend 'fooled around' a bit. We were fully clothed, I was jacking him off when he stopped me, he always stops me right before he cums. He sort of pulled the top of his penis up. Then shortly after he touched my hair and I am afraid that there was precum on his hand? If so would this cause me any harm? And aswell I accidentally touched my hair where he may have touched it and then maybe an hour later pulled down my jeans as I went to the toilet. Is there a possibility of me becoming pregnant from this? I did not touch myself anywhere around the vaginal area by the way, just around my hips and behind! I've been panicking for days as I'm not very well educated with this stuff but I heard its possible to become pregnant without having sex and with precum!
Although it is true that "its possible to become pregnant without having sex and with precum", somehow the fluid with sperm has to enter your vagina before you can get pregnant. It also has to happen in a fertile time. From what you have said, there is no chance sperm could have got into your vagina, so there's no chance of pregnancy.
If you want more information on the reproductive process, just ask.