Ovulation

Sarah
I have no idea when I'm supposed to ovulate. Still haven't gotten a positive. 
I went off bc got a period March 28th then nothing until May 10th. I've been tracking cm and just trying to bd every other day.  Starting testing yesterday but as cd13 no ewcm 
Supposedl in fertile window next week , which will be starting cd16 according to glow but according to ovia I'm in it now. 
I don't want to waste ovulation tests until i saw ewcm but not sure what to do or if I'm even ovulating since being off bc??