Provera

I have taken provera 10mg- two separate times for ten days each: once I started December 15th, second I started January 7th. I STILL HAVENT GOTTEN A PERIOD! Like no spotting, nothing. What is wrong with me? I usually get a period a day or two after taking provera but this time I haven’t had a period since the middle of October and I can’t seem to get one. Anyone else experience this?? What do I do? Like how many times do I take provera if it’s not working?