“Regular birth control pills”, aka combined oral birth control pills, contain estrogen and progesterone and require you to see a provider to get a prescription (doctor, pharmacist, physician’s assistant, nurse practitioner). Opill is a progesterone only pill, meaning it does not have estrogen. With the progesterone only over the counter pill, if you are late taking it by 3 hours, you will NOT be protected against pregnancy. If you had sex and took the Opill 3 hrs late, consider taking some emergency contraception to prevent unplanned pregnancy.