I am so sorry for everything you have gone through. I can't even begin to imagine. Can your mom help you find a free grief support group in your community? A lot of time there are groups that meet for no charge. They sometimes are led by a trained professional, but other times are just a bunch of other people who also lost someone close (some groups specialize in people who lost a child or an unborn baby). Usually these groups will meet at a local hospital, church/temple or funeral home. The grief counselor you met with that one time might be able to help direct you to a place in your area or you could try calling places on your own (if you are religious, you could probably ask your youth group leader or pastor/rabbi for a recommendation).
I know when a friend of mine lost her son she said she was really helped by posting to GriefNet (www.griefnet.org/
. They are a moderated forum. They're free. And they have a special section of their site for teens. You might be able to find other girls your age who have also lost their unborn baby who can understand what you're going through.
Also, sometimes counselors are willing to meet with people for free or very, very cheap if they know you are in need. I had a counselor I saw in college who would see me for whatever I could pay (usually $15/visit, but sometimes $5 or nothing if I really didn't have any money that week). Maybe the lady you saw could see you for little to nothing, or could refer you to someone else who was willing to see you regardless of how much you & your family could afford to pay.
Finally, have you considered going back to school? Being away from school can seem like a good idea at first, but being away from friends, activities, a set schedule & a sense of normal life can often make the depression worse. A good friend of mine had to leave school when she got pregnant. She decided to enroll in correspondence school & tried to keep in touch with her friends, but a lot of our activities centered around school and clubs and dances and stuff so it was hard to include her in much. And then we just felt really awkward. Only a couple of us kept in touch with her. But then she came back to school -- maybe 4 months before graduation -- and things went back to normal pretty quickly. Maybe that won't work for you, but I thought I'd mention it b/c I know how much it helped my friend Kelly.
I think you have some really good plans, though. Becoming a police officer is a great idea! Can you do that with a GED? I know the military only takes high school graduates, but if they will take you in the local police with a GED that's a great job with a lot of opportunities for the long term. There's definitely a future for you with that field. :) Regardless of what your parents think, just keep working towards your goals each day. You will be in a better place before you know it!