Yes, DeQuervain's is quite common in moms. I had it in my working days really, really badly. I have small hands, and when working as a pediatric PT, I always overstretch my hands. Stretching kids, holding kids on therapy balls, you name it-lots of strain on the tendons of the wrist and thumb. It is very painful if that's what you are dealing with. If you decide to pursue an evaluation, a physical therapist should be able to get you some relief and rule out anything else. I had it flare up after having my DS1, but it wasn't too bad with subsequent kids.
Mama to DS-2004
DD-2006
and a new addition-ds born march 2010