[how.we.operate.]

I don't really think there is much you can do to "rescue him"...I mean of course you can support him, but how would you "rescue" him? I do get that you want to help and all, but what could you do for him besides being there for him?

My opinion is that you should move on from him; he seems to be in trouble a lot. He's been arrested for "small" things--I count possession as a bigger thing--when will that stop? You will feel like you need to be there for him, but he is older...he needs to learn to be responsible for himself and he needs to learn how to handle his life. You aren't expected to hold his hand through life...he needs to learn to do so.
I'd say break it off until he can sort out his life...you shouldn't be constantly worrying about him; you should be happy instead.

In terms of the pregnancy test, is there any hints as to why you think you might be? You'll have to wait till your period gets closer--there are some that tell you 6 days before your missed period--but some aren't. If you didn't use a condom, I would look into the test. Don't freak yourself out yet though!

I hope things go okay with if you get a test. As for everything else, take time to think about yourself...not about him. Think about what this means for you.