Mini pill norethindrone

Does anyone else use this pill? I have questions about it. I've been on it for 5 months. Take it correctly. Never late and never missed a day. I had my period already this month for 3 days and a week later starting yesterday i am bleeding again and still am today. Is this normal? For someone who has been on it for 5 months. I know the first 3 months i spotted/bleed in between periods. Stopped my 4th month and now its like I'm doing it again. It feels like a normal period too. Should i be concerned? Has anyone else been on it for awhile and dealt with stuff like this?