I had taken plan b some time in february, and now I want to take birth control but I was wondering if it was ok. The thing was my second period after the plan b was a whole week late. I did research and saw that a lot of women were saying that plan b made their second period late. I want to start my birth control , but I am afraid it will confuse my cycle even more. Is it safe to go ahead and use the birth control? will it make my period more late, or will it regulate the period?