Last month, my girlfriend had her periods on 27th Sep. She was supposed to have her periods on 27th Oct. She has observed the pain but the periods did not happen as she was travelling to Switzerland and she has stayed under the temperature of -5 to -7 degree for 6 days. She has not have had her periods till now. What could be the reason for this doctor? Also, on 17th of Oct we had made love, but did not have sex. But my semen was onto her under garments and it was wet. Would this be a reason. Or there might be any other reason for this?