Hesitant on when to start using my opks

Deiona💕

Okay I bought the pack of easy @ home opks but I only have the 25 count pack. So I’m trying to use as less as possible before I have to put another order in. I really don’t know when I ovulate but I would say that my cycle is pretty normal. Would you guys say starting on cycle day 10 is to early? Or should I wait until cycle day 12 to start testing? My cycle is usually 32-33 days long.