Been to the docs.. Blood test.. Progesterone!

Hi all.. So I went to the doctors this afternoon as I'm scared that somethings up.. To cut a long story short i was diagnosed with under active thyroid young and they advised my ovaries may dry up early(around 30) my husband and I decided we did want another baby and knew our clock was ticking.. Anyways the doctor has asked I do a blood test between day 3-5 of my period so I'm having it done tomorro as it will b day 4 then another blood test on my cycle day 21 then back to the doctors a couple of days later.. It's says progesterone on the second blood form.. I no its Hormone checking.. But has anyone else had this?? Xx