Post surgery questions

I’m a little over a month post limberg flap surgery and I was just wondering if it’s normal to still be experiencing it to swell after I sit down for a little while. Also when I lay on my stomach which is the only way I can lay comfortably my scar area gets swollen and red and warm but when I stand up it just goes away I was just wondering what y’all thought bc I don’t think it’s infected.