low progesterone

Brittany • Mommy to a beautiful boy 6/8/17, Pregnant with baby girl due 9/11/19
So I just called my doctor for the results of my blood work, and the good news was that my numbers doubled in two days. But they did tell me my progesterone was low, and I have to take progesterone suppositories twice a day for the entire first trimester. I am a little nervous about this, I really do not know what this all means. Has anyone else experienced this? I had a miscarriage in July, so I am very scared of anything going wrong with this one!