Birth control and long period????

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So I’ve just gotten on birth control and I’m in the 3rd week of using it. My period came early and so far it’s been lasting longer than usual. I thought it was finished today because of how light and pretty much non existent my flow was throughout my day but I just went into the bathroom (mind you it’s 11:17 PM when I did this) to see that there is a lot of blood coming out still on my cycle log I’m on day 10. Can someone explain if this is normal or not PLEASE?