Back pain??

Hi ladies.

I’m currently 17wks 3 days. A few days ago while at the grocery store I had a sharp pain in my lower back right above by butt on the left side. I didn’t think anything of it. Fast forward to yesterday, while at the store again. I could feel my hip? Leg? Not sure exactly what it was but it was the same spot as the sharp pain I previously had. Well I noticed I could feel it popping. It got more intense today that even my s/o could hear the popping. I tried cracking my back hoping it would go away but nothing. I’ve been having back pain in the same spot all day. About an hour ago I tried getting g up from the couch and the pain was so bad I could barely even stand. I’ve never had back problems before. But it’s freaking me out. I’m not sure what to do. If anyone has tips or advice I would appreciate it. My mom said it could be my sciatic nerve? And if it continues to go to the hospital but I do t want to go if it’s something common? I never experienced this with my first pregnancy. Also this morning when I woke up I had severe cramps. It went away after a little while.

TIA!