When Can A Women Suffer From Menopause?

Could i be going through menopause at the age of 35? Hi, i am a 35yr old woman who has had her tubes tied for about 12+yrs now since 2002. I have always had my menstrual cycle every month faithfully and regularly at a heavy flow, BUT last month i did not have my cycle and now this month for the last 3/4 days i have been at i very very light flow, i have only really used one pad and i only released about a strip line of blood but when i wipe the toilet paper is sometimes red or pink and then nothing. To be on the safe side i bought a one step pregnancy test at walmart for $4 but it came out negative. This has never happened to me before is this normal? Could the pregnancy test be wrong but my tubes are tied? Or am i going through menopause? Please help?