41 ttc number 3

Hi guys! This month I had a weird cycle. I'm ttc after a miscarriage last October 2014. I had my period Aug 17th for 4-5 days. Again it started Sep 4th the time I was supposed to be ovulating. Now I'm confused and don't know when I'll be ovulating. Anyone else with the same situation or know what might be going on. Sooo frustrated! 😢