my cycles have always been 27-29 days then in december it was 36 day which i attributed to stress but for awhile i did consider i could be pregnant but i never tested. then next month (january) my cycle was 35 day and then in February my cycle was 30 days long. I'm on day 35 now and i have horrible cramping and nausea for the past week headaches and I get very tired earlier than usual. my boobs are so sore they hurt to touch. Not sure if its pregnancy or if it could be because i just started taking prozac about two weeks ago. i have taken two tests one on tuesday and one today (friday) both were negative