Help! Should I be worried? uncomfortable lump on left side.

I am 17 weeks, 6 days now and I am not showing yet, for the past 2-3 days I have been waking up with my stomach being lob-sided. It feels uncomfortable and sometimes even painful. Does anyone have an idea of why this is? Is it the baby curling up on my left side ? Because it definitely feels that way. It only happens when I’m laying down overnight, I try moving positions but I still wake up with this ball on that side. Should I be worried/Call my doctor?