progesterone insufficiency
"I am using this in my FET cycle for IVF.  I am 4 weeks, 4 days pregnant.  I was taking 2 vaginal inserts (100mg) each per day but after blood tests came back showing a very low Progesterone level, my Dr is having me take an additional 600 mg per day in pill form (200 mg, 3x per day).  My Dr warned me that I would be very tired and possibly dizzy.  I have been on the pills for 3 days now and have noticed that my breast are very tender and swollen which they weren't before and it does make me a little drowsy but not bad, It's manageable. I go back on Tuesday to check my levels."