Progesterone for a couple of day's

Angelica
Hi everyone, well my doctor just put me on progesterone yesterday. She told me las week my progesteron was 17 and yesterday it drop to 12 now i have to use it for a couple of day. I only have 4 weeks and 6 days i'm scare because today all day i been having light cramping i don't know if this is normal. And they only see the sac im just praying that everything comes out good when i go back on tuesday. Has anyone has gone through this?