Sharp Side Pains

So... I've been having round ligament pains all day. Whenever I lay down, either side, sitting down, etc. It's sharp and sudden, even when babyboy moves but only on the left lower side. I took a warm bath and it helped temporarily. Now the pain is back, in the same exact spot. I get up and walk it off, it stops, then it comes right back. My tummy only gets tight when I stand up. I'll be 36 weeks on Sunday. My sister was a doula and is in nursing school (with 5 kids of her own) and she said it's just from my muscles being stretched. Should I go urgent care to be safe? See what's up? 😓