Is it normal

Is it normal to be late while on birth control?
I don't take the pill at the same time everyday, could this be the reason?

How many days late are you?

What's the brand of pill you take?

Generally taking the pill will make your periods more regular.
It's recommended to take the pill at the same time each day. If you miss a pill, you should aim to take it within 12 hours of your regular time.