Is this sciatica?

Your baby is moving down so it will be putting even more pressure on your sciatic nerve. Sadly, it ll likely only resolve when you give birth. I experienced similar pain, although not a severe as what you are describing and the only thing that worked was resting and being in bed. Xx

I had that I would just ask your OB what you can have

Hello, I have lived with sciatica even before I was pregnant so the best thing you can do is definitely sleep on the opposite side, take warm showers and do cold compresses, I would also recommend doing gentle stretches like you sit in a chair and then you twist one way and then you twist the other way and then just start doing more stretches like lean from one side to another!