Regular period. Am I actually ovulating?

I just came from my obgyn and she told me that since my period is every month then I’m ovulating. I got off of nexplanon in August and I haven’t gotten pregnant yet. I do Clearblue Advanced Digital ovulation test and I always go from low to peak. I have no medical issues. Why am I not getting pregnant. Any advice? We have also tried Smep. Maybe I am not doing smep right or using the preseed correctly.