Periods too close together?

Question

So I believe I just started my period but the only reason why I'm iffy about it is because the last day of my previous period was only 18 days ago..I've never had periods that close together...anyone else ever experience this??

Answer

It was November 13th to the 17th.

Answer

5 days like normal..am I counting my cycle wrong..is it first day of period to first day of the next one?

Answer

How long did your last period last?