Butt cramp/ numbness on the side

yes, I have butt cramps too. Similarly I use a pregnancy pillow and it helps relieve the pain. Sometimes I get my husband to help massage too. as per google: The sciatic nerve runs from the buttocks down the leg. During pregnancy, the expanding uterus and growing fetus can put pressure on the sciatic nerve, causing a condition called sciatica. People with sciatica often experience pain in the buttocks.