when did I ovulate?

Ok so I had a postive ovulation test on March 28th after coming off bc. I had really bad cramps and spotting on the 29th well today is 27dpo and I've been getting bfns well last night I thought I got vvvvvfl on a test but this morning I started spotting. This would be my first period true period in a year and a half and it's not at all what I expected. I'm only spotting just wearing a panty liner right now and I only have pain in my left hip and left side of my back no cramps or anything and I have shoulder pain. I have a Dr app tomorrow but if this is my period when the heck did I ovulate. Here is my chart and I know I was supposed to chart before ovulation but I had just started and wasn't expecting to get a postive ovulation test.