as 2 weeks ago my fore finger was stuck downwards and had a cramp that lasted for a minute and today it was my thumb, on the same hand, was stuck downward and went under my hand that lasted more than 2 mins and was abit more painful.
I had carpal tunnel during my pregnancy and it was horrible...but it wasn't anything like what you have described. It didn't come and go and it wasn't cramplike at all. It is always worth mentioning anything to your midwife just so they can put your mind at rest.
y mention it as it can be a sign of other possible problems such as blood pressure and/or water retention. I get crampy thumb and finger also "fizzy" almost numb , pins and needles type sensation in the same two, down the inside. I get it when I am stressed, hot weather, put on a little weight, blood pressure up. Glad you are mentioning it to your mw, hopefully nothing to worry about but sensible to let her know and keep an eye on it.
I had carpal tunnel with in my first pregnancy just in my right hand and arm. I always got it at night and would wake up in agony! It is always advisable to mention things like this to midwife. I was told there wasnt anything that could be done except for wearing an arm splint in severe cases. Luckily my symptoms stopped as soon as i had ds and i didnt suffer at all with dd.