ece- my fertility specialist (as I wasn't seeing an OB at this point) has women stop at 8-9 weeks (including those who have had IVF). I convinced him to let me stay on it until 13 weeks, but stopped on my own at 11-12 weeks because I was tired of remembering and knew it was safe. which type of progesterone are you on? I think that makes a difference. For endometrin (vaginal), the pamphlet and my doctor both say 8-9 weeks. For prometrium, everything I've read and my old doctor said the first trimester