This is Dr. David
yes, Gynera could be causing your nausea.
you can stop the birth control pill, but then you don't have protection against pregnancy.
gynera contains 75 micrograms gestodene and 30 micrograms ethinyloestradiol
there are many other types of birth control pills that you can take.
your doctor can recommend something else which does not cause nausea for you.
let me know if you have other questions.