I would do (and have done) the BT to check levels. Ended up needing progesterone shots as well. If I had crinone already I would use it. Like n2l mentioned - it's expensive, but you could always switch to pessaries later?

Anyway, I'm sure if your FS says you don't need them then you probably don't. But they will do no harm (side effects excluded...) & I'm a bit like you - would rather feel like I'm doing something. Good luck. : )