I Started Taking Microlite Contraceptive Pill At The Of January.

I started taking microlite contraceptive pill at the of January. I havent taken any break on the pill since starting it, ive taken my packets back to back. I've just started into my third packet now and am having bleeding. Is this because im meant to be on my break and having an actual period? This happened last month as well when I was meant to be on my seven day break but wasn't. Also the bleeding that time lasted nearly three weeks