I'm on that one, although I have to get the brand 'Ovranette' from the Dr because Microgynon works differently for me. I've had no symptoms at all, weight loss is achievable & the pill doesn't affect it at all.
just bear in mind you'll get some replies from people like me, who have had nothing but good experiences with this pill & some from people with negative experiences. You will react the way you are designed to react so really the only way to find out if it affects your weight loss is to try it
As long as you're mindful about what you eat then you should be ok. From what I understand, the pill doesn't actually make you gain weight, but it can increase your appetite. Maybe for the first couple of months, while your body is adjusting, keep a food diary so you can justify any weight gains/losses.
I hope your experience is like mine.. I wouldn't go on anything else.
Of course, I would suggest that if you are prescribed Microgynon then you should get that every time instead of swapping from that to Ovranette like my Drs made me. They thought I was mad to think there was a difference, but there really is! (It's the same for most meds.. My brother is on a particular brand of epilepsy drug & he can't take the generic version because the composition is slightly different)