You want to get a full range of hormone and other tests to know your levels, and what numbers are high/low. Then you can have your dr pick a pill that would work with your levels. Yasmin helps lower testosterone and other androgens, so anyone with high numbers (myself included) woudl benefit from that - my hair loss from pcos has slowed with yasmin
BUT - if you have other levels that yasmin might put out of whack, it could definitely cause symptoms such as hair loss - thats why getting thefull range of hormone and other related tests is great, so you can choose the right pill with the right level of the right things in it

A gyno can do these tests but even better is an endocrinologist .