Weight struggle on Microygonom 30?

Heya! I've been able to loose allot of weight 17stone to 12stone over a year and bit..
But I've recently gone on the microgynom pill ( been on it around 6 months? ) And the weight seems to have stopped coming off a bit? or incredibly slowly?
I know pills are like an ultimate for " DOES IT MAKE YOU PUT ON WEIGHT" or not.. Is it worth staying on it? I'd be happier thinner and more healthy, but if this pill is stopping me..

Anyone else have a problem with this pill? :s