It's hard to say.
The pill is only effective if you take 7 active pills consecutively, so if you just took 4 pills then you were not protected.
But on a positive note if you started taking it during your period then you probably weren't going to ovulate on the 4th day of taking the pill. Please get a pregnancy test done just to be sure.
It is recommended that you use back-up birth control, such as condoms or a spermicide, when you first start using this medication.
- Sprintec Information for Consumers
- Sprintec Information for Healthcare Professionals (includes dosage details)
- Side Effects of Sprintec (detailed)
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