Hi I Was Taking Norethistrone Tablets To Delay My Period

Hi I Was taking norethistrone tablets to delay my period for an event.. After I stopped taking them and waited for my period.once that started I was very heavy then it lightened. I had another event and was still on my period so I took 2 tablets of norethistrone and started taking my contraceptive pill. 2 days later I bleed again.but light. And I'm still bleeding now. It's been 3 days since I stopped. Now my cycle has gone on for 9 days. I'm still currently taking my new contraceptive pill on the hope it will stop it. But it doesn't look like it is. Please can u help to tell me why I'm still bleeding thankyou