That's just basically a heat pack. I'd try the pillow in between the legs first and see how that works for you. And if you do the rice sock I wouldn't leave it in that area for more than 10 minutes. To be safe
Idk if I should've done this or if it's safe but I put rice in a sock and heated it up and put it between my legs cause I was having pain there as well... It helped soothe it and didn't hurt as bad anymore I didn't know What to do cause my Dr office has been closed for holidays.
I had it too. Then when I slept I put something in between my legs the whole time I slept and I haven't had it since. It could be that, basically your hips are spreading more getting ready for the baby. That's what it was told and it's worked. I'd try that for a couple of nights and see how it tat works for you.