<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hello, I have been taking a pill called Cerazette for five months now, I have had no periods whilst taking it, but for the last two weeks or so I have been having cramps in my abdominin. I am sexually active but I have taken pregnancy test which have showed negative. Any ideas what it could be?  <response>: Hi.Ive gone through your query and I can understand your anxiety. Cramps are common with birth control pills. The link between these cramps the pills is due to the effect of the hormone prostaglandins which triggers the uterus to contract. Cigarette pills has higher dose of progesterone, which on long-standing usage make your cycle ovulatory resulting in amenorrhea. This might be the cause of no periods with negative pregnancy test results. Hope I have answered your query. Let me know if I can assist you further. Get well soon. 