Yep, normal range is 3x a day to every 3 days. More or less is possible but that should be checked by a doctor. If it was always once every 5-7 days it's probably nothing and normal for you. If something changes about the rhythm then go see a doctor and that can mean you're one of the once every 3 days people and now you poop daily. Even if it's inside the range, go see a doctor!

And one myth: if your body is the slow type like every 2-3 days or even 3-5 days fibre and stuff won't help, it's just a heavier poop (in weight) after 5 days than usual.