I take Contraceptive, can I get pregnant for a few more days?

I take Contracep, but it is for 3 months, but has a month that has 31 days and ends up spending more than 90 days, can I get pregnant because of those extra days?
Expert answer:

In fact the ideal is to count 90 days and apply the injection, however 2 or 3 days more will not decrease contraceptive efficacy. You will not get pregnant because of these extra days.