Does anyone know if missing a dose of cyclogest could cause a miscarriage? I am pregnant after a FET (only 4 weeks, still to have official blood test on Tues) but on Friday I missed my afternoon dose of cyclogest. I am on 400mg three times a day, so that day I only had 800mg in total. Can't believe I could be so stupid, it was a hectic day at work and I missed my alarm.