Never happened before!! Advice!

Meghan
I have pretty "normal" cycles. Every 28 days for about 5 days. But I'm April I had 2 periods!!! One on 6th for 5 days and one on the 28th for 5 days. It's confusing. I'm 28 and I've read that younger girls can have more irregular cycles like this. Just need some advice on why this happened.