It is definitely annoying, but as everyone has said, it is important. When do you start regular NSTs? I think I started every other week at 28 weeks and every week at 32 weeks.
Also, it may be time to talk to your doctor about work. Aren't you also commuting quite a distance?
I remember having contractions when I walked for too long, especially if I did not stay hydated. Drink, drink, and drink like you are hooked up to a water IV. My MFM also told me I could drink kool-aid and gatorade to try and keep my fluids up. I always noticed if I slacked on my water because I would hit the grocery store and have crazy contractions.