Hi and welcome,
I understand your concern. Oral contraceptives are known to cause adverse effects. The stomach sickness and
diarrhea may be due to OC's or may have other causes like infection [ more likely and common].
However Gastric infections and diarrhea may decrease the efficacy of oc pills. So you may have had an early period. Please use a backup
contraception and begin a new pack from day 1 of period.
Also try to take the pills after meals at bedtime. The peak levels occur during sleep and cause less
nausea.
Watch for the next few periods. If they are regular, do not worry.
If the periods remain irregular, you will need an investigation for other causes like
hormonal imbalances, polyps and fibroids.
Hope this satisfies your query.
Thanks for using HCM.
Feel free to ask any more questions that you may have.
Dr Madhuri Bagde
Consultant Obstetrician and Gynecologist