Should I be worried?

I’m 15 weeks today.. the past couple weeks my belly was growing and it felt hard on top.. I did have a belly before so the bottom of my belly I had a pouch.. but I did feel the top of my belly was getting hard.. well a couple days ago it went away, the hardness its just squishy.. should I be concerned?? This is my 5th and I’m scared something happened.. no bleeding at all, still have the same nauseous symptoms as well.. maybe I’m just over thinking it 😭😭 or could it just have been bloating?