This month marks the 4th year since we decided to try for a family of our own. We have had all the tests and we were diagnosed with 'unexplained' infertility approx 2 yrs ago. My periods come every month, usually on the dot and last 6 days. I have a 27 day cycle most months. We have regular sex especially around the time of ovulation (every other day or every 3rd day) as advised by the clinic/doctors. I have a history of bowel disease and 3 major operations which I worry is stopping something from doing what it should. I also have Hashimoto's but I don't think this is the cause as my periods are regular. My partners tests were all perfectly fine. How do you cope with the 'not knowing' why?? :( Thanks all. 37 yrs old from Cambridgeshire.