Lauren Papanos MS,RD,CSSD on Instagram: "Ovulating—but your basal temp or progesterone stays low in the luteal phase? This is one of the most common patterns I see. Regular cycles. Confirmed ovulation. Yet progesterone barely rises in the early luteal phase. Here’s the part most women are never told: This usually isn’t an ovarian problem. It’s a thyroid signal problem. When thyroid hormones are lower—especially T4 and T3—progesterone output during the luteal phase drops, most noticeably around d