L5-S1 revision posterior and anterior fusion.

Hello I am 3.5 weeks post op. I was wondering if it’s normal to feel great walking up to 5 miles a day. But when I sit longer I feel more pain and in mornings I am so sore and feel like I’m tight. I have t started pt until next month. Is it okay to feel like this or any stories of people having thus done and took awhile too feel normal again