<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi, i just had a quick question. I have been diagnosed with PCOS, and have been given Dianne 35 birth control pills for this reason, and also to clear up my acne. I also plan on using it for contraceptive purposes just to be safe. My question is, since my periods are irregular the last one i had was 3 months ago and still no sign of getting it soon, am i able to start the pill at any time or does it have to be on the first day of my next period i just dont want to wait that long, as it could take months. Thanks!  <response>: Hi, I think what you can do is to take some progesterone for 7 days for your periods to come. When you will stop the progesterone periods will come within 1 to 2 weeks, then you can start Dianne from day 1 of your cycle. Just dont forget to do a urine pregnancy test before taking progesterone. Also, I think you should do a thyroid profile and prolactin and an ultrasound for your follicles to rule out the cause of irregular periods. Dianne can be used for contraception. Hope I have answered your query. Let me know if I can assist you further. 