Me and my boyfriend were fooling around I had my underwear on and he didn't.. he rubbed up against me down there a few times but never went into my vagina.just rubbed up against my underwear... could I still get pregnant?

No.

Do you understand how sex works? Penetration is necessary to get pregnant.

With that said, are you on birth control? Are you ready to be a mother?

Well there was seamon coming out of him, and I wasn't sure because, I am having stomach problems but its been a week since this has happened.. so is it just stressing about this?

If your asking a question like this there is no doubt you are far to young to be having sex or even thinking about having sex

You mean SEMEN. Do you mean he ejaculated?

Penetration + ejaculation = pregnancy

Sweetheart if you can't even spell semen I don't think you should be having sex.

Other than that, no, pregnancy is not possible unless you have sexual intercourse.