No, you shouldn't be scared. Tell your parents as soon as you can. You may find that they offer more support than you think.
When your baby comes along, take off as much time as you're allowed, so that you can bond with him or her.
I know a couple who're in the military police, and they faced a similar dilemma. However, they eventually married and now have two lovely children - and still manage to hold onto their careers. It won't be easy, but at least you have the offer of help from your bf's parents. Best of luck.