Should I leave??

Ok so here's my situation, my fiance and I found out we are pregnant about 2 weeks ago. He started smoking weed again, he doesn't help around the house. All he does is eat sleep and go to work!!

Now when I had a dentist appt to get my wisdom teeth removed he was supposed to drive me because I didn't feel safe driving myself afterwards. He decided not to take me, when I tell him my issues and ask for help or tell him my issues he decides it's not ok for me not to work anymore! (I have 2 kids from a previous relationship and until recently he helped and acted like they were his but now doesn't do anything!!) I've been liking for a job with no luck and he throws out in my face that I don't have one. Says I do nothing but babysit the house and kids!! As if that's not a job in itself!! We got into a fight and he told me to abort the baby....which I'm thinking about giving it up for adoption because I can't afford an abortion!! I feel lost, and I can't stop crying, anyone have any advice and please no negative comments!?