As the mother of a 2 year old I had with an alcoholic, I beg you to stay on the pill, use condoms or whatever form of contraception necessary. Things are NOT stable for the moment and it is not a good environment to bring up a child in. We're not talking about having too small a house or something...we're talking about someone who is clearly unready for parenthood, which if I may say so, is a HUGE STRESS (as in, many many months of sleepless nights, colics, nursing issues, various health issues, financial stress, etc etc).
If you have doubts, LISTEN to your instinct. That's something I learned through SR...when in doubt, do nothing and more will be revealed.
Keep posting! SR is a great place to find support.