Symptoms of perimenopause or pregnancy?

Hello, I was hoping someone could answer my question? Ok, I am a mother of two children ages 16 and 20 and am 44 years old. I am in pretty good health. I have been on a Liver Cleansing diet for a few months and have lost a bit of weight and am feeling better than i was before diet. Not extreme loss! Diet includes alot of soy milk and protein. I have had 2 early periods: 1, 2 months ago about 21 days from the last one.(Normal for me is every 27 days)then last month about 24 days. Normal flow. This month nothing but a mere streak in panty 35 days into cycle. Took a pregnancy test around day 33 but read negative. Is this possibly a start to menopause or should i do another pregnancy test? Thanks for help...