I know a few others do this (take Utro continuously) at a younger age too - Jedi Girl I think? I guess it's no different than taking the contraceptive pill continuously like, for example, GypsyRoseLee does? That said, my GP wasn't as easily convinced as I still have (irregular) periods. Utro seems to be one of the few progesterones where the dose remains the same, regardless of amount of estrogen. Do you take it vaginally, Nina? If so, you're more likely to be absorbing it 'where it's needed' so you should be ok. We need Hurdity to confirm! x
PS I found this link. It's interesting that it doesnt say the 100mg continuosly must only be taken by post meno/ladies over 54 - though on other sites, it contradicts this.