First U/S and low progesterone, supplements started...advice needed please

Hi ladies, So on Tuesday I had my first U/S.  First the U/S went pretty well except according to my LMP I was suppose to be 7 wks but the U/S said 6wk1day. Doctor did say the machine could be off though by a week. She was excited to see the heart beat though and so was I, DH and I were so relieved. After speaking to the doctor I had asked to have my progesterone checked because I have stalked around alot and read a lot of you ladies need progesterone. Yesterday the office called me back and told me my levels were 8.98. They put me on 200mg vaginal suppository (TMI) 3xday until I am 10 weeks pregnant and my next ultrasound.  I am relieved because of my history that possibly I have saved this little bean and because I have stalked you ladies enough that you have helped me to advocate for myself so a HUGE THANK YOU LADIES!! Well today I have some cramping and I am pretty tired, which I am assuming is related to the progesterone. Have any of you ladies had these side effects with progesterone? Is there anything else I should know about progesterone that I haven't already read that you ladies might know. Any advice would be extremely helpful!! Thank you ladies! God Bless you all!