I had this around 20 wks in my 2nd prg, about 30 wks this time, my friend had carpal tunnel syndrome during preg and had a similar symptom. In my case, my MFM thought it was swelling in my hands, and this time that's definitely the case.
Could be the start of carpal tunnel, but if you notice swelling anywhere else at all, *I'd ask for a 24 hour urine*--(okay, maybe not in your case since I just remembered, you just did one, right? Maybe in another week or two if it keeps happening and you feel swollen). I recently dipped +1 and clear in the same day, but did a 24 hour urine because of the +1 earlier in the day, and turned out I was spilling 700 mg of protein when I did my 24 hour urine the next day.
Me (29) DH (30)
#1-Olivia Caetlyn-9-28-09-9-28-09, 23+2 wks, emergency classic c-section, class I HELLP, IUGR
#2- Lucas Oliver (rainbow baby)- April 2011, 36+2 wks, HELLP and pre-e free! (lovenox and LDA pregnancy)
#3-Matthew, late October 2012...mostly normal, 37 wks, (lovenox and LDA again)
My blog: http://www.butterflies-and-rainbows.blogspot.com/