Does it make a difference

Blanca

So I take the pill everyday, forgot the name of the pill but I take the 35 mg & I have taken it everyday. I’ve never missed a day, been on birth control for about 3 months already. However, there are days where I don’t take it at the exact time because of different situations, so my question is does the effectiveness of contraceptive decrease or remains the same if I decide to have sex?