As Opal mentioned, a few years ago there was a vlog where Sabre went through all the preferred names for her 6 or 7 kids, all some variation of her own name or starting with the letter "S". Was it just a flight of fancy, a common dream of a young girl? So why the sudden extreme 180 degree turn, saying she's dead set against having kids? Just a simple idea for content, spawned from their round-table discussion where they speculated Naz would be first to become a teen mom? Perhaps there's more to it. This was before she learned of her medical conditions.
It's important to remember that Sabre has hypopituitarism,
a small pituitary gland, which is why she had undergone growth hormone treatment. She's finished with the growth hormones now and will probably need to begin sex hormone therapy. It's a permanent condition and she would have to continue the therapy for the rest of her life. There's two methods for this, one is a transdermal hormone patch that is applied to the skin. The other is birth control pills. This method is usually favored by young female patients of her age as it has the added benefit of contraception. Hypopituitarism is also associated with an increased risk of pregnancy complications, such as abortion, anemia, pregnancy-induced hypertension, placental abruption, premature birth, and postpartum hemorrhage. Each pregnancy would have to be planned and her health would need to be closely monitored along with the growth of the fetus. This could be a factor in Sabre's sudden change of heart for a big family of her own. She may change her mind as she matures and weigh the risks for having one or two kids.
So, with this said the 'pregnant teen mom' video might be a cover to keep her current medical condition more private. You know, in case a viewer sees her birth control in the background of a future vid. Or it's just simple clickbait content.