I just got an email from my RE’s nurse. She said that I can switch to Endometrin (progesterone suppositories) on 7/1 and continue until 7/21. She said I can continue the PIO until 7/21 if I’d rather do that than the suppositories. My question is - I will only be 10 weeks on 7/21. I thought you were supposed to take progesterone throughout the first trimester. Is that too soon?!