So what exactly are you asking? Should you have an abortion? Clearly, if you don't want one, you shouldn't have one.
However, your little story illustrates perfectly why I am PRO-ABORTION. What on earth were you thinking? What did you (and the low-rent sperminator) think was going to happen if you had unprotected sex?
Really, go and get sterilised. There is really no way on earth that you should be having another child. Your writing is clear and quite grammatically correct, so you are obviously not a complete brainless numbnut -- why are you acting like one?
Give it up for adoption if you don't want an abortion and can't look after it.