slightly worried/ need advice

Emily • 24 World traveler, and in love with my hubby & pup
So I am my second pack of birth control, I'm still pretty new to it and last month my period came super early about 18 days between my last cycle. My average period is every 25 day before I started taking The Pill and this month I am 5 days late. I'm not sure if it's just stress with school or if it's just my pill and body getting use to it and fluctuating. My only concern is, I am sexually active. We don't really use condoms and sad to say I haven't made him cum in like 3 weeks (due to our busy schedules & So I'm very sure that I am not pregnant. And he never cums inside if he does.)
Just would like some advice, so I can stop worrying so much. Do you think this is normal?