Do Provera And Plan B Counteract?

Hi! I am currently not on birth control, but i do take provera to start my period due to a very irregular cycle. I had unprotected sex and took a plan b 2 days later. i am very nervous about being pregnant, but i do have polyscistic ovarian syndrome and i don't know if that decreases my chances. It has been 2 days since taking plan b and it is time for me to take my provera. If i start provera will it mess with plan b working? or will i be fine to start taking it?