What is this pain?

Bronna

I'm almost 23 weeks, and I've been having sharp pains on both sides of my belly button. It's worse when I've been standing or walking for awhile. If I sit for a bit, it subsides. Is this round ligament pain? Would a maternity belt help? I need help! I have an appt with my OB on Monday so I can mention it then, but just wondered if anyone else is experiencing the same thing.