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Ok, well you can wait for him to file (which he may or may not ever do) or you can file the Petition yourself. There is no legal advantage to filing first, but you could ask for spousal support in the interim. You obviously do not have to get an abortion if you don't want to, and he will have to pay child support for the child once it is born (as well as medical expenses for the child birth).
You should probably go ahead and file for divorce, seek temporary alimony and asset division. This is your best bet for the immediate future, only because you will probably be entitled to some alimony at least while the divorce is pending (you may be entitled to permanent alimony too, but that depends on a number of factors).
Given that you situation is somewhat complex, it would probably be worth your money to hire an attorney. So that is what you would need to do as a first step.
I am not allowed to give you a recommendation to a specific attorney on this site, sorry.
You can search for attorneys, the attorneys are rated by their peers as well as clients: www.martindale.com