Tracking ovulation to not get pregnant

Hii , so I was on birth control for 6 years , right after my period came on time . I didn't have to wait months for my period to come back like I heard . A doctor I was talking to said that it's a very good thing , and there's a high chance I am fertile .

I do not want to get pregnant right now or any time soon , I just like how my body feels without all those meds in me so going back on birth control is out of the question . We do have condoms on stand by though .

My question is though , how do I exactly track when I ovulate ? I'm gonna get the test strips but I'm still so confused . Maybe on how to read them .

I am currently tracking my bbt every morning but then I just read that I won't know if I ovulated until days later . Which just adds to my confusion 😅

Are there any other ways to prevent pregnancy/ know when I'm most fertile with out taking contraceptives or using condoms?