There are lots of different pills to try, just because Yasmin worked for you it doesn't necessarily mean it's going to work for Monkey Maiden.
After only 3 months of use your body is still not properly adjusted to the additional hormones you're pumping it with. Running packs together to avoid a bleed works for most people, but not all. Due to lack of adjustment, sometimes people still bleed even if they run packs together because natural body hormones just cause the womb to shed.
I wouldnt worry about it. It didn't work this time. As long as you're not having any other problems with microgynon I'd stick with it for a bit longer and maybe try not to run packs together for another couple of months. This is probably what the doctor would tell you. If it still doesnt work out, there are 20+ different varieties of combined pill, each with different/different levels of hormones to try, to try and find one that suits you.