Relatively reliable and useful information about some common concerns regarding perimenopause are contained in the link below….it discusses the definition of perimenopause, when it starts, signs and symptoms, treatments, pregnancy, and offers links for more information. http://www.womenshealth.gov/faq/perimenopause.cfm
This information is made available by the National Women's Health Information Center (NWHIC) which is considered by some to be the most reliable and current information resource on women’s health today. Because NWHIC is sponsored by the federal government, as a service of the Office on Women’s Health within the U.S. Department of Health and Human Services, they don’t benefit by selling you something or promoting commercial interests (unlike some pharmaceutical companies, some book and magazine publishers, some medical providers, and yes, some doctors, etc.). Their purpose is simply to help you get the information you can trust on a variety health issues of interest to women.