I pretty much have been having regular periods. I travelled and had sex a week to my period date.That month my period came 2 weeks later, I saw my period after taking ecp from having sexyon the 13th of August (AF 22nd of August instead of 8th) I have a 35 day cycle and was expecting my period on the 27th of October now I I am 10days late with no AF symptoms .negative pregnancy tests.