Hi, so basically I've watched too much Glee in the past 24hrs.

I was wondering if there were any Buffy-is-pregnant-in-high-school fics where Spike is not necessarily the father but meets Buffy while she's pregnant?

Try Baby Love by Niamh. I think its here on SpuffyRealm but if not its also on Just Rewards

Link for Baby Love by Niamh:

http://spikeluver.com/SpuffyRealm/viewstory.php?sid=10127

Other than Baby Love I can't think of any high school fics where Buffy is already pregnant by someone else. There are some where she already has a child but...

There is a great WIP (long already and I think still posting - I hope!) that is not high school but does deal with a pregnant Buffy where Buffy lies to Spike about him being the father. Which is kinda a Glee thing, if they weren't in high school any more. It's:

Lie In The Sound by DrkDevin

http://spikeluver.com/SpuffyRealm/viewstory.php?sid=24906

Summary: Buffy and Spike had lived separate lives until a drunken night in Vegas changed everything. Bound by a lie born out of fear, they seize the opportunity to use each other for their own benefit never expecting to fall in love. When the truth is revealed, will it rip them apart? Or is their love strong enough to survive?

I honestly can't think of any others where Spike isn't the father...

I remember reading a story where B and S were not in any relationship, not even friendly at first. Then she got pregnant with Riley's baby and R reacted badly - he told her off for being so stupid and everybody overhear. So Spike decks Riley for being a moron. That's all I remember. Maybe anyone can tell me what story it was. I remember liking it.

Serinah
That's sounds pretty interesting, I'd love to know the name of the fic too!