Mama, swelling on one side that's getting worse day by day after CS, please see your doctor or go to the hospital soon, okay? This needs to be checked in person kasi it could be something that needs proper care.
A few of us moms had swelling post-delivery, but most improved with the meds and time; the fact na tumatagal and worsening on just one side is different, so don't wait. Your doctor needs to see you asap to make sure everything is okay. Sending you strength, mama, you've got this!