Warm/cold icy hot feeling

Merium • Married since June 2014, momma to 2 littles 💗💙.
We found out on Halloween that were pregnant with our first! I started feeling a funny sensation in my uterus that day. I would describe it as an icy hot feeling. It's warm then cold. My sister is 20 weeks along and she said the same thing! Anyone else feel this way?