Has this happened to anyone?

I'm 18 weeks and last night I was feeling my belly (I haven't really felt her yet, maybe flutters here and there) and one side of my belly was really hard...like a lump. So of course my anxiety gets the best of me and I start having a slight panic attack. I immediately felt the other side and it was soft so I went back to the originally spot and it wasn't hard anymore?! Is it possible that it was my daughter? Or am I crazy lol