Not trying but not avoiding

I’m not sure if this is the right group to post in. I didn’t know if it would be inappropriate to post in the ttc group. I’ve been off birth control for a little over a year now. I’m 24 years old and I think pretty healthy! I have a normal period and use opks every month to learn more about my body/ovulation. I haven’t been ttc but also haven’t been avoiding pregnancy. Me and my partner are in a good spot mentally, emotionally, and financially that we could welcome a baby. I’ve had a handful of months within this last year where we’ve had a lot of sex around ovulation but haven’t gotten pregnant. Is this a red flag that I may have fertility issues? It just seems like so many people get pregnant by precum and on birth control and so many other scenarios where they were preventing and we haven’t and he finishes inside of me every time.