Totally understand the worry, that bulge above the wound can look really alarming! From what I've heard, it's actually quite common at this stage because the internal incision is still healing underneath, so fluid and swelling can build up right above the scar line even when the outer skin looks okay. Someone in my mum group mentioned it took them almost two months for that puffiness to fully settle, which honestly sounds long but apparently is within the normal range, a heating pad on low heat was something a few of them found helped with the discomfort. That said, I won't sugarcoat it: if there's any redness spreading outward, warmth to the touch, discharge, or you're running a fever, those are signs you really shouldn't wait on and should get checked straight away rather than assuming it's just normal healing. Every body heals differently, so it's genuinely worth calling your gynaecologist or polyclinic doctor just to get eyes on it and rule out anything like a seroma or infection, better to go and be told "all fine" than to sit and wonder at 16 days pp!