Mild pain near incision can come once in a while after cesarean section. If it becomes severe or have any discharge from that site, then you need to show a doctor.
You can do regular household work, walk and use stairs. No problem in doing that. Pain could also be due to muscle strain, which will subside slowly.
Blood in stools can be due to fissure or piles. It can be due to constipation especially if you are also taking Iron. You can pause your iron tablet for a week and restart later. You will have to avoid constipation by taking high fiber diet and plenty of water.
Next Steps
Can consult a general surgeon for opinion on bleeding in stools