Pain on left side 20wks pregnant

Im a First Time Mom

Im in week 21 (20wks 3 days) i feel pain and discomfort on my left belly (far left of my belly button) i also noticed baby movements are on my left side but lower (close to the left side of my abdomen) i also think my egg was released from my left ovary (i had a corpus luteum cyst on my left ovary and i read that it could be from where the egg was released or fertilized, something like that)

This made me assume my baby feels more comfortable on my left side. Ive had round ligament pain which was sharp and sometimes dull but doesn’t last, but this one is so uncomfortable and with my growing belly i can barely lie down well. The pain goes and comes but it feels different from the round ligament pain i used to have, are there different sensations to round ligament pain and could this be it? Its not unbearable but just uncomfortable and slightly painful (i have high pain tolerance though)

Can anyone explain to me what it is, and if they have had such sensation before.