It doesn't matter if you came or not, well not for getting pregnant anyway. If your boyfriend had an erection he probably had precum. That does not mean you are going to get pregnant. If you don't want to get pregnant don't 'experiment' like this, or get some proper Birth Control. Accidents happen.
if he had nothing on and so did she there is a possability of getting pregnant,you do not have to have sex to get pregnant if his sperm gets in her she could get prgnant
That close to your period, it's hard to tell. Precum always carries the risk of getting you pregnant too, but if you're concerned, pick up a pregnancy test to be sure.
If he precame, it probably broke. If you're tasting it I'm assuming there is a hole.
Yes, of course. The odds are far less than if you had regulation sex, though.