[Quartet]

You need to take a pregnancy test, first of all!
And inducing a miscarry is exactly like an abortion, just a dumb idea.
A pregnancy test costs like MAYBE 20 bucks, if you go to a Target they're like $7.50 for one test - $10.00 for two tests.
You could put yourself in severe danger if you do this without any medical help.

As stated above, there is a medical abortion, it ranges from $300 to $500, depending on where you go to do it.
It's a lot of money, and I'd hate to say it, you and your boyfriend landed yourselves in this situation.
Talk to him about it and let him know you're not willing to put yourself through something so dangerous.