Pregnant and 15!

So my boyfriend and I have had unprotected sex ( he's 17 and we've been together 5 months) (we wouldn't mind having a baby).!!! I DO NOT NEED COMMENTS ABOUT MY AGE!!! My period is late by 2 weeks but pregnancy tests keep coming back negative, I looked it up and some don't show positive until 3 or 4 weeks in (all depends on your hcg levels). Told my mom my period is late and she asked if I was pregnant and I said I had no clue. She's gonna set up a doctors appointment but she was mad. I told her I use protection and she said I shouldn't even be having sex, then she told me i gotta get an abortion or put it up for adoption. I told her hell no, I'm just not like that. She said the baby can't live in our house and then she started talking about the bills and money. Just one question, are there any funds that help teen moms and their doctor visits and such? I know there's MA, but how does that work??