Bbt temperatures and ovulation?

jen • Momma of 5 boys!💙 and we're done! 😅

Can any one tell when i ovulated? I thought the 15th due to symptoms and cm, easy@home says the 18th, and glow says 20th due to bbt. My temperatureis all over the place all month and this is only the 2nd month ive tracked with it. I'm trying to avoid pregnancy and use it as birth control. But i think im going to go back to test strips.