missed period

is it normal to miss a period when you’re on birth control? i’m on microgestin fe, i take it every night at midnight, my bf and i use condoms (there were 2 times in the last month that he didn’t but he pulled out), he usually pulls out except these last few times but then he uses a condom. my period is very regular due to my pills but before pills it was quite irregular. it’s 4 days late...is missing a period normal when you’re on the pill?