Missed Period on Birth Control

Payton • My name is Payton. I`m 16. I`ve been in a committed relationship with my boyfriend for 8 months !
Today I was supposed to start my period. I haven't yet & I'm very worried. This is the first period I was supposed to have since I started birth control. I'm sexually active & we use condoms here & there . Is there any way that I can be pregnant ? Or is it okay to miss a period on birth control ?