COMPLETELY CONFUSED... NEED HELP.. PLEASE RESPOND... TY IN ADVANCE

The test line is darker than the control line... I am new to this... so that meant I am ovulating... so I'm bd'ing. I am just coming off the mirena Aug 21st. I thought I had af 3 days later lasted 5 days. So glow said I ovulated a week and a half ago and I am due to start my period on the 20th... so I am so cinfused. Could the test be wrong... and if not and I am ovulating how long do I wait to be able to take a hpt test cause I now have NO IDEA when I will start?????