I'm kinda worried! 😓

Rachel
So my boyfriend is in the mood military and I am not sexually active. My problem right now is my last 2 periods were a little late and only lasted 4 days. Mine usually last 5. Now it's 3 days late and I'm kinda worried about if I don't get my period does that mean I can't have kids? I'm not in any birth control. Can someone help?