Not only were you at no risk of pregnancy whatsoever from what you describe, but you've had TWO periods since. Relax.
And just for future reference, you're not going to get pregnant from anything but your partner ejaculating directly on your vulva or in your vagina. Well, okay, maybe if he took a handful of semen and immediately inserted it, but that's about it.
You have nothing to be worried about.
If you seriously aren't considering pregnancy at this stage in your life though you should think about a suitable form of birth control.
there is a very very small chance u could get pregnant like that. try not to worry.