I'm 10dpo, 6th day of using Progesterone suppositories. Our fertility dr thought I might have low prog, so prescribed the suppositories for 4dpo-14dpo. So far, my usual PMS symptoms of moodiness, cramping, and spotting haven't started, which is great. But my boobs are sore (not just on the sides, but all over) and they are swollen and bigger than normal. Of course, now I'm wondering if the bigger boobs is a progesterone symptom, or pregnancy symptom. 2 1/2 years trying. Tested with a FRER this morning, which was negative, but I don't know how accurate they are at 10dpo