Get some multi packs of actual Maternity knickers (not just big pants or scratch paper knicks which are always too small). No need to spend a fortune. Tesco do a five pack for £7 which are soft cotton and super comfy and go nowhere near the scar.
You still need maternity pads even tho you've had a CS! Sainsbury's and Tescos own are fine.
Avoid in particular, reaching, lifting and twisting actions.
Sitting up in bed is very hard. Get a hand from someone, or if you're on your own, take your time and do it slowly.
You might feel back to "normal" in 3 days. Don't be fooled. It is only because you feel better than shit, not because you are actually better! TAKE IT EASY. Don't be bending to pick up that dropped nappy/put shoes on etc. Ask someone else. Don't be a hero.
DO NOT wear ANYTHING that rubs on the scar even after 1 week. This includes PJ bottoms, knickers, maternity trousers, normal trousers - anything. If you can feel it rubbing, get changed. If you don't, it can lead to the area getting inflamed which can lead to an infection. I wish someone had told me this.
Take all your meds as prescribed even if you feel OK.