1. Get your schooling in now. Over half of teen mums don't graduate. Limited schooling also makes it harder to get a well paying job so hopefully your significant other is bringing good money home.
2. You'll have to save a lot. To raise a child up to 18 years costs on average $300,000. With low income jobs, that's a tall order and as parents you'll have to go without but I'm sure you'll manage it.
3. Prepare yourself for the possible health problems associated with teenage pregnancy. There's a much higher chance of serious complications for both you and baby - including disability and death.
4. Accept that it will drastically change your relationship with the father, and chances are you won't stay together, adding single parenthood to the mix. He'll still get to do what he wants when he wants though, since it's usually the mum looking after the kids. When you are ready to move on, understand that your options in the dating pool will be very limited with a child.
Hope this helps!