Pregnancy question for you ladies: I've been having a pain on my left side under my boob at the top of my rib bone when…

Pregnancy question for you ladies: I've been having a pain on my left side under my boob at the top of my rib bone when I lay on my left side or sometimes even when I'm sitting up. My friend told me it might just be gas.... Just worries me since it's so close to where my heart is. It just started the last few weeks and is painful to where I can't sleep on that side. Any advice or thoughts? Was gonna ask my dr tomorrow at my appointment. But not sure if it's normal. If I push down and rub it it's very sore 😞