ive only been on Yasmin for a week...after switching from alesse....

ive only been on Yasmin for a week...after switching from alesse. im experiencing constipation...and i feel as though ive lost some weight. i know both are caused from the diuretic but other than increasing your fiber intake and the amount of fluid consumption...and taking a laxative are there any other suggestions? the whole sex drive decreasing side effect worries me...one other individual said this would happen down the road if you don't have it now. what causes it?