Heating pad??

Megan • My DH & I have been together 1 1/2 yrs. I brought 3 kids & he brought 2. Just found out #6 is on it's way!!!!!!!!
Does anyone know if it's safe to use a heating pad for upset stomach and cramps? I've been wracking my brain trying to remember but it's been 7yrs since last baby and I just can't ?