Senior Dating A Freshman, Need Advice

Like the title says, I'm a senior and my GF is a freshman.

Everything is cool, I've met her parents and they've met my parents. We're both from Christian families.

She and I already know we'll get married as soon as she is old enough. The problems for me right now are...

- Our parents don't know we've been intimate. We know it's wrong but it's bringing us so close together and it's not totally wrong because we are already committed to each other and planning our wedding.

- I've been pulling out reliably to avoid getting her pregnant.

- She's a very mature girl for her age. She'd be a responsible mother.

- She is baby-crazy. I think she gets it from her friends. Maybe a bit from church, too. We're pretty strict Christians so most moms in our town stay home and raise babies instead of working.

- She knows what she's doing and keeps tempting me to leave it in instead of pulling out. I've come pretty close the last few times.

So I don't know exactly what I'm asking here.

What if I stop pulling out and I make her a mom? Is that bad? It's what she wants, our family would be started earlier, and I think having a child would keep us close together until I can marry her.

Is it a worse blow to tell our parents we've been fucking? Or to tell them later that they are about to become grandparents? I don't want arguments and tears, I want our parents to see that my GF is making this choice with her eyes open.

Once she starts showing, can she stay in school or does she have to stay home and go through the pregnancy without showing anyone.

Ima go be with her now but I would really appreciate advice. Please be nice, even if you give advice that's harsh. You can be old or young, I want all voices. Thanks.