We will start TTC in another 2 cycles (first week of August).

I need to figure out when I ovulate but I forgot everything I used to know about TTC.
Am I supposed to start the day my period ends (usually about cycle day 6) and go until I see a positive? I really don't want to waste test strips.
Should I just start on cycle day 12? and go until...maybe cycle day 17?
If I remember correctly, I never ovulated until day 15 before I had LO. But, that's probably changed.

*I won't be temping, only LH strips and looking for EWCM