Am I pregnant or is it the plan B?

Daniela • Kasumi & Kassiani’s Mommy 💕💃🏻
I got my period 15 days before I its actually suppose to start I took plan be less then 24 hours after having unprotected sex. I have tender breasts, headache, fatigue and lower back pain (cramps) could I be pregnant? Will I get my period the days I was suppose to when should I take a pregancy test?