I turned 40 in October. When I was morbidly obese, I had very irregular periods. For the last 4 years or so I have not been morbidly obese and my periods have become very regular. When I was in college I sometimes had minor cramps but have not had them in years. For the last several months in a row, I've had pretty strong cramping on the first day or two of my period. Is this a sign of perimenopause?