I have pcos. I have tested for thyroid but got negative. I am 19 years with normal bmi weight. I am having irregular periods from last two years, my new doctor suggested me to use meprate, before I used regestrone only once. Now it's been 7 days after taking tablets two times a day but I didn't get my periods? Why? Is it because I am using different tablets now? What should I do to get my periods? Should I take regestrone tablets now to get my periods? Is it ok to take another tablets again?