I started having some tingly feelings in my hands. When I went to the Dr's to have some chiropractic work done I mentioned it and he said that pregnant women can develop problems in their hands... more specifically carpal tunnel.
Not so much fingers getting stuck, but definitely issues with my thumb and wrist. Not sure if it'd work for your situation, but I've found that wearing a brace that keeps things in a neutral position (esp when sleeping) has helped a lot.
My ring fingers on both hands get stuck and feel like a rubber band is giving way when they finally bend upwards and my other fingers are tight and swollen and painful to bend for about and hour or so. Only happens after I've been sleeping or napping. Yay pregnancy:)
Re: Carpal tunnel and trigger finger