Provera for irregular periods or no period

Ash.

Hi my dr recently prescribed provera a 10 day pill that is 10 mg because I have been having irregular periods my periods have been starting 5 weeks later than 4 weeks. My current period was July 3rd and I have took 4 test they are all negative. I am a little afraid to take provera because of all the side affects. My partner and I trying to conceive as well. Has anyone else used the provera pill?