Are low dose birth control pills any less effective than higher doses at preventing pregnancy?

Low dose: Low dose are just as effective as higher dose ocs. With both make sure not to miss a day, but with lower doses, you need to take it about the same time every day. They have a smaller window for administration and may be less forgiving. That being said, take it same time every day and it will be 99% effective.

Dose and birth contr: The most important thing will all birth control (also known as oral contraceptives) is that you consistently take them. Missing doses and taking medication with other medicine and foods (herbs) can affect the effectiveness of the birth control pills. Please know pregnancies can occur even if everything is taken perfectly. Birth control is about 98% effective so there is a chance of pregnancy.