CS mom here

Aw mama, three weeks pa lang so it's still pretty fresh, pero that sharp, stabbing pain on your side especially when you move is honestly something you should let your OB check ASAP kasi it could be anything from normal scar tissue tightening to fluid buildup, and better safe than sorry after surgery! A few of us had similar concerns at the 3-week mark and honestly the peace of mind from a quick check was worth it, plus your doc might give you exercises or ways to manage it na talaga namang tumutulong. Hang in there, first-time recovery is tough but you're doing great