I just wanted to know if anyone has taken the pill Loette.

I started to take Loette about a month ago and noticed that I started spotting 2 days before I took the sugar tablets. I went to the Dr out of concern and was told that apparently alot of women who take this pill, change it as it isn't strong enough and your period can come earlier.

Having not been on the pill previously I don't know what the different types are so I don't really know what i'm doing to be honest.
My main concern is, if it's not strong enough, can I fall pregnant whilst still taking it. I know there is a 1% chance you can fall pregnant whilst on most pills anyway, but is there a higher risk.