My doctor changed my birth control pill to Micronor because of migraines.. and now I'm afraid to take it and get pregnant due to the single hormone...

It is important to take Micronor consistently at the same time every day to ensure its effectiveness in preventing pregnancy. Any delay of more than 3 hours can decrease its efficacy. If you happen to forget a dose, you can contact your pharmacy for emergency contraception. It is also recommended to use additional protection, such as condoms, during sexual intercourse for extra security.