Hello, All combined oral contraceptive pills have similar protection rate against pregnancy. Unfortunately, there is a 5% risk of pregnancy in a year in women that use it as it is with other oral contraceptives. So, yes, it may happen to become pregnant even if you use it regularly, even though this is very rare the case. Sometimes, there is bleeding in the early pregnancy and the women may interpret this as the next period. If you are concerned you may be pregnant, please take a urinary pregnancy test. I hope this is helpful and answers your query. I remain at your disposal in case further assistance is needed. Regards, Dr. Antoneta Zotaj General and Family Physician