I had tingly hands for a while and my husband googled it for me and what he found was that basically a lot of women experience numbness or tingly feelings in their hands and arms throughout pregnancy. Perhaps it has something to do with the growing uterus pressing on different nerves or something? I don't know, I'm not a neurologist. If you're really concerned, call your doctor. (I personally think that any symptom that frightens/worries you warrants a call, because the stress alone can be exhausting and unhealthy.)
ETA: Your doctor probably receives lots of 'stupid' questions throughout the day, so if this turns out to be nothing, don't be embarrassed. "Worry is the work of pregnancy."