Pregnancy scare

Hi I’m 16 I’ve been with my boyfriend for 3 years now and we love each other very much and my period is a whole week late now and I’m kinda scared I started taking my birth control again the day before it was supposed to start so yeah that could be it for sure but I’m still pretty freaked out but we did just have sex this Monday and he wore a condom idk I’m just super freaked out