regular period without ovulation?

AMR • on a weight gaining and yoga journey... one day we will be a family of four 🙏🌈

I thought your period would be irregular if you weren't ovulating? my period is always 28 to 31 days ever month and I've been tracking for nearly a year. I am a bit under weight, bmi is 17.5, which is why I wonder if I'm ovulating or not and I know it's not optimal for fertility. but my periods are super regular in all aspects. what is going onnnnn.