one but not the other

You feel like hell. Your body is wracked with pain and you have no idea why. You spend the day in bed or the shower. Eventually your mother comes in and gives you some midol and asks you if your period is bad this month, you touch your pussy and find there is lots of dark blood.

You spend the next few days resting. When you get back to school Alyssa runs up and hugs you "Hey girl, were you sick? I missed you so much" you hug her back loving the feeling of her warm body pressing against you "Na just had a really bad period." she freezes up "you... had.. but... oh no..." you pull back and look at her "Whats wrong?" she looks like she is about to cry "I'm late"