Progesterone?

Sarah • 3 pregnancy loses. 4 failed IUIs, IVF with 1 failed frozen transfer and finally have our healthy boy!! Momma of a 3 year old, angel twins 10/19, and successful fresh IVF is giving us boy two in November!
Two things. If anyone can help?! 
1. Anyone know how last progesterone levels increase once you start with suppositories? 
2. Anyone have any side effects? 
Just started today and want to know what I could expect. Thanks!!