okay so is there a reason that I could have only had some spotting for a day and a half instead of my period??

My period was supposed to start on Friday. On Thursday and Friday I had some dark reddish brown spotting only when I wiped and checked my CM and it was only a little bit. It was some stretchy cm streaked with reddish blood. And that's it. Nothing else. Haven't had anything since. Has anyone had this happen before? We have been ttc for 14 months. And in march my obgyn gave me provera because my period was a month late and it made my period start on April 1st. So my next period should have started yesterday and still nothing only spotting that lasted a day and a half. Didn't even need a liner.