Ovulation test :) comments needed thanks

I no its not 100% positive but when should I test again in your guys opinion glow says ovulation will start Aug 15th. I had two miscarriages 1 and January 1 in April and for the last few months seems like from what looked like ovulation started after period like quickly.... But this month is different because I've been off my period for a few days now and haven't had a positive yet. So am wondering if my ovulation ect is getting its self back on schedule as it should be??? Idk if hormones where all out of wack ect. So hopefully this is our month :) and for all you lady's out there good luck