Expert answer:
Probably, this is a possible effect due to doubled contraceptive dose.
Doctor, I forgot to take the contraceptive one day, so I took two pills the next day. It was about 19:30 when I took it, at dawn I woke up with a lot of seasickness, I had never felt so much a feeling of nausea in my life. But I did not vomit, because there was nothing in my stomach. Was this caused by contraception?
Probably, this is a possible effect due to doubled contraceptive dose.