Confused Teen in need of help

Hi I'm new to this forum. I came here because I needed someone to talk to and do not know who I can trust. My situation is that my 15 year old girlfriend is pregnant. I'm 16. She is about 12 weeks pregnant and really confused. We considered our options, but so far we haven't done anything or really talked about it. I'm not sure what to do. So far I've been wanting to tell our parents about it, but she doesn't want anyone to know. I know that if our parents find out, they will probably separate us. Neither of us want that. Although I actually prefer not telling my parents something inside me keeps telling me I should because I really want to help my girlfriend. Right now she is way too confused and has no idea what she wants to do. Keeping the child would be difficult at this young of an age and pressure from peers and parents may make it even more difficult. I don't know how my girlfriend feels about it, but all I know is that she said to me she doesn't want to have it. I haven't considered adoption too much because if she doesn't want to have it, adoption is not a choice. Abortion was our other thought. We researched about it and found out we could do it without telling our parents. She doesn't want to go through with the surgery and I don't want her to either. Also, cost and finding time to do this is another problem with abortion if we want to do it unnoticed. I really don't know what I want, and I don't think she does either. Sometimes I bring up the subject, but I stop when she says "I don't wanna talk about it right now". Today she was pissed off because she was thinking about it. Recently we have been arguing a lot over small things. Well anyways, she started to cry while I was at her house and told me she hated me for getting her pregnant...I really wish I could take that day back. I've only blamed myself for this, and want to take responsibility for everything because I really love her. It seems like I can't do anything to help her right now and that makes me feel even worse than I already feel. She even told me to leave her house and go home, but I just couldn't. We both thought we could get through this alone, but it looks like we can't. That's why I've come here. If anyone has any advice on what I can do to help my girlfriend please tell me. If not due to time restraints I would love to see a helpful response, but as a highschool student I must sleep because I have school in 5 hours. Wow 4 hours of sleep. Didn't study for test. I guess people really do mature and learn what's most important when they come upon a life changing event.