Hi SCM10,
I've been searching and looking everywhere and the only story that comes close to what your looking for is the Cast me not away series by Enigmaticblue. It's complete on
AO3 and some stories are on
EF.
Summary:
Spike leaves after «Dead Things,» wanting nothing more than to get Buffy out of his head. Wesley's still an independent contractor after the events of «Loyalty.» And the Slayer's still living in the land of denial.
The first story covers 4 years after S06 (so kind of P-S), Buffy is pregnant with her last Boyfriend Peter who leaves her. Wesley's love interest is called Danika and is a midwife (who indeed wears long skirts and has a wikka vibe
). Starts whit Buffy and Spike apart and ends up whith Spuffy.
If it's not the one, I hope it'll be a good read for you until the right one comes up.