a preg BT at 9DPO would quite possibly be inconclusive - they do a progesterone test to check for ovulation and if that is consistent, would assume that, if AF shows, you stay on same dose - if not, they go up. i would think if AF hasn't arrived by about CD 40 you could get a pg BT, but for now, the dr sounds like he is hedging his bets and working out what needs to happen if you're NOT pg.