If you weren't ready to have a baby then, you aren't ready now. What is getting pregnant now going to solve? Yeah, you may get excited about this new baby and whatnot, but the feelings of regret will always come back until you deal with them. It isn't fair to the baby, you or your boyfriend for you to be trying to get pregnant right now.
Your parents couldn't have forced you to get an abortion. They may have talked you into it and I am very, very sorry about that. Have you explained that to your bf's mom?
Your parents should not have done what they did. That is apparent. But, I am sure they were thinking of what they thought was best for you. Getting pregnant again right away, what is that seriously going to do? You really need to stop and think about this.
I understand that you are in a great deal of pain, but getting pregnant now is not the solution. You need to find someone you can talk to, either a counselor or a friend. Anyone. Take the time to heal from this and then figure out what you want.
Don't you want to make sure you are with the person you want to spend the rest of your life with (which you may be, I don't know), get married and then have a baby? No, life doesn't always happen that way, but you still have that choice.
Anyway, this is all just my opinion based on my knowledge and the things I have seen in my life. You can ultimately do whatever you choose, I just don't want to see you make the wrong decision.
Having another baby may make you all happy and to help forget what happened, but it also may make you feel worse. Going through the pregnancy and all of the experiences a new baby brings, may just make you all wonder what the other baby would have been like. You may end up feeling a lot worse instead of a lot better.
But good luck to you in whatever you decide!