Hi.
I know this is a late reply and I'm a new member so you might prefer advice from someone more experienced, but nobody replied so far, so maybe it will still be helpful.
From what I've read (and I have been reading for days now) the fastest way to do it would be K1 (Fiancee visa). You can check the guides here for K1 and K3 (Spouse visa) and decide for yourself what you'd prefer doing.
Either way, good luck to you and congratulations!
