19BBT (Basal Body Temperature)
No, this does not refer to the temperature of the body, according to basil leaves. Instead, it means the body temperature at its absolute lowest point during the day, likely at bedtime while the body is resting. Knowing individual basal body temperatures can play a part in determining when to try and have a
Since the basal body temperature rises right before ovulation, as the female body releases more progesterone, it becomes a way to know when ovulation is about to start. And, because we're all well-versed in high school health, we all know that ovulation equals prime baby making time. So, knowing about basal body temperature and its value when trying to conceive is just one part, while talking about it ends up being a whole other part of the baby making and trying to conceive culture.