These side effects are not usually harmful. Most go away within 3 months. It they do not go away or are severe, see your doctor. Switching to another type of pill after a 3 month trial may help. If you miss one period and have taken the pill correctly, you should keep taking the pill.
Most women forget to take a pill once and a while.
If you forget to take one pill, take it as soon as you remember. Take the next pill at the normal time. It is okay if you have to take two pills in the same day. It is normal to feel a bit queasy if you do this. If you miss more than three pills, stop, discard that pack, wait for menses and begin on Sunday after the menses begins.