Have a few details.
Dawn had a boyfriend whose parents are part of a church group that want the baby. They think if they don't sacafrice the baby the world will end. Boyfriend is conflicted because he likes Dawn and Spuffy. Dawn tells him Buffy and Spike are discussing baby names though IM, his mother reads the IM convestation.
Buffy goes into Labor at Anya's wedding. Refuses to go to hospital till wedding is though. Spike ends up rushing the minister, and carries Buffy out.
Dawn has to go to the bathroom before the wedding and discovers the cult.
Buffy has a job as a waitress at the Bronze. I remember on scene where Spike compares her legs to a peppermint stock or babershop pole. Stating that she has a ring of fluid around her ankles.
I believe the boyfriens name is Ryan. Not sure.
I think I read it on ff.net, along with another archive. It was a long fic. 20K+ words. | 
