Hello
As you mentioned that you are taking diane 35 and
metformin because you are also having PCOS. You are also try to get
pregnancy for last 6 years, but in vain.
Cyproterone acetate is sometimes used for ovulation . Since you didn't mention the history of your menstrual cycle , status of ovulation ( study of ovulation ), the size of mature follicle ( dominant ) , thickness of endometrium.
In my opinion this is very difficult to say , why you are not getting pregnancy .
Vomiting may be the symptom of pregnancy ,but it require confirmation by gynecologist.
In my opinion upload all report including
ultrasound report of both ovaries , thereafter , we will be able to say something.
Hope this will be useful for you.