Hi Guest,
Pregnancy always bring a new side to certain people that never expect it. My husband the first time I told him I was pregnant sat on the couch for 4 hours and literally did not say one word, I was absolutely stunned that he could do that.
Just remember that this is your body and you can decide what can be done with it, having the baby is your choice and obviously his support would be helpful. Many girls have done it in your shoes, my next door neighbor is your age, single and has 2 young children and is a full-time waitress and gets subsidy from the government for childcare so she can work.
He will need to take responsibility no matter what he decides to do after your decision. Hopefully it will be the right decision for you and for him.
Good luck and hope this helps