A lot of cervical mucus during period

I started oral progesterone one month ago because my periods are practically nonexistent. Well it seems to be working as I had some bleeding last night. But it's slowed down a lot today and there is a LOT of mucus mixed with it. Not to be confused with blood clots. I think the cm is clear. Has anyone else had this? Is it normal? Or a side effect of progesterone? Thanks ladies!