Why did I get my period twice a month but not the month after?

I got it on the 15 for 4 days then on the 26 for 4 days too and on the 26 I had sex and I got it after that. But I didn't get it this month so I am really scared and don't know what to do. Am I pregnant??? What could make me get it twice a month?

You might want to look into that elsewhere, sweetie. The average cycle is about 28, correct me if I'm wrong. I don't know if the "cool down" period which is the amount of time before you next period. I don't know if I varies from woman to woman, but most likely it does. Don't feel scared, it's just the way your body feels like working.