Well, that's what all the doctors said, so I kept taking it and it kept getting worse. I had benign ventricular ectopics, but they got so frequent (every other beat, sometimes running into each other) that I reached the point where I was often too dizzy to stand up or think). Then I was sick, forgot to take my desogesterol, and they got much better. I tried taking it again and they came back within hours. Did that 3 times to convince myself it wasn't a fluke. My cardiologist said that hormonal changes can bring in ectopics, so she thought it made sense. I have a low heart rate anyway, so she had been reluctant to prescribe beta blockers, and I was about to start flecanide.
I still have the ectopics, but the frequency is much less, only if I'm tired or push myself exercising. Ie I don't think the desogesterol created the issue, but amplified it.
Because of that experience I'm concerned what happens with menopause, but we will see.