Is it true???

I ovulate around 9/10 days before my expected period, I know this because of symptoms and I got pregnant once 9 days before my period (only time I had sex that cycle)

I read in a forum that to keep the pregnancy, you have to ovulate at least 10 days before your expected period for the hormone levels to be high enough.

Is this true?? Because I did end up losing my baby a few days after my positive test, and I did conceive 9 days before my period.

Has anyone heard anything? How on earth am I ever supposed to stay pregnant if this is true? Thank you!