Trying to figure out this whole ovulation thing!! help lol

I got my mirena out beginning of January, have been ttc since.. I spotted after and thaen last week had a full period for about 5-6 days ( well I believe it was my period) the first test was positive then the lines faded now a few days later it's dark again? Glow said I was ovulating with the first test.. but the last test(taken today) glow said I'm not ovulating.