Congratulations on your pregnancy. It sounds like this little person was mean't to be.
Your right termination is an option however given your history and the fact nothing is really certain can you risk potentially not having the opportunity to fall pregnant again?
As far as I'm aware depending on your income and weather you would like to return to work and when you may be entitled to a single parent pension which can help with the cost of living whilst your baby is young. I was in that position when my relationship ended when my daughter was 12months old as I was still at uni and couldn't work with study and a child. When she was 3 I found full time work when I was qualified.