Hi,
The same exact thing has happened to me. I was taking amitryptiline 10mg at night. My last period was on time. I always have an exact 30 day cycle. We refrain from sexual intercourse for 12 days over my ovulation days, 6 days at each side and always have to e extra safe. However, my period is now a week late and I am worried sick that I am pregnant, even though I know I have been safe. My worry is that the Amityptiline has delayed my ovulation. Have you found out anything more about this issue yourself. Thanks