Hi Minnie,

I have used progesterone gel and from what I understand the side effects are pretty much the same. Cramping is the main side effect I had. Sore boobs too. Unfortunately the same kind of symptoms as AF or pregnancy. Your period will also likely be heavier and more painful.
Also, if you get utd, don't stop taking without medical advice as there is a risk of miscarriage if the levels of progesterone drop too quickly.

Hope this helps!!