late period and no PMT symptoms.

Hi There,

I have a regular 28 day cycle. My last period started on 25/03. We had unprotected sex on 29/31 March, 5/9/16/17/19 April. My period was due on 21/04. I have had no PMT symptoms other than a bit of cramping. Today, 24/04 I've had a red/brown discharge, evident when I wipe (sorry). It looks a little like old blood. I don't know whether or not to test or wait a little longer. Any ideas?

Thank you

Sophy0506 xxx