What Causes Brownish Stains With Slight Bleeding?

Dear doctor, I have been tri cycling with my pill. I am on diane 35. So sometimes i bi cycle or tri cycle as adviced by my gynae previously. And it has made my life much easier, especially when i used to get bad cramps and heavy flow before. But recently, after the 3rd strip of my diane 35, and i did not miss any pill, i started having blood stains daily, so i thought i may have gotten my period, and there was slight cramping too, but no heavy flow. Just blood stains daily. So when i reached my last pill, i did not stop for 7 days coz i was afraid the mensus would continue and besides, i already had the blood stains or light period for like a few days while on the pill. So i continued the next strip. And i'm on the new strip now..but after a few days, i started getting blood stains with slight cramping again. It's been like a week now. And i'm having brownish stains with slight bleeding. So i don't know what the problem is. I hope it stops soon. Should i just carry on to the next strip of pills since there are just 4 left on this strip to go? I'm afraid if i give a 7 days break once this strip ends, then i will be bleeding again for another week. What should i do? Pls advice..thank you.