Belly button pain?

🍀Meghan🍀 • Engaged to the best man in the world! And a mommy to the best baby around 😘!
Ok I'm 24 weeks and started having this annoying pain to the left side of my belly button. My dr won't be back in her office till Monday, I mean it's not agonizing pain just annoying and goes away when I lay down.. Any idea what it could be?