This is the one I have and it comes in various heights. I put it under the mattress, between mattress and box spring, rather than using it as a pillow.
I second the ice cream before bed. I also had this issue pre pregnancy and this pillow is my lifesaver. Input my regular pillow on top and sleep at a nice incline.
Brentwood Therapeutic Foam Bed... https://www.amazon.com/dp/B00DTZVKFM?ref=ppx_pop_mob_ap_share
i went with this one; with that under my torso/shoulders and a normal feather pillow under my head, it's seriously so freaking awesome. :D i can even sleep on my back with this (which has been great the last few days when i couldn't sleep on my right side), AND my husband doesn't have to wear earplugs anymore! ahhh, life is good.
Sometimes the bed riser thing can be an issue if you're not alone in bed. So get one of these bed wedges.