Oddly enough it is possible for women to get pregnant and not realise it. My 15 year old stepson's mother first knew that he was on the way when she was 7 1/2 months pregnant. She had a long history of chaotic hormones due to polycystic ovaries and had extremely erratic periods. Earlier in the marriage she had been thoroughly investigated in the hope of being able to conceive and had been told that she was infertile. The shock on finding that she was pregnant years later was colossal. It was normal for her to have no period for such a length of time so she had no reason to be suspicious, she hadn't put on any significant weight either. Apparently, once she knew she was pregnant, the weight piled on, psychosomatic reaction or what? She was 42 at the time. I have a theory that women's hormones have a final push before menopause starts. What do others think? She was a very late baby too, her mother was 48. The human body is never without surprises.