Can you be perimenopause before age 30?

Some background: I'm 29, I started my period at age 8. I have given birth to 3 children. I'm trying for another child. I was 6 days late on my period, & never had this problem before unless pregnant. But on day 6 I started my period & bled heavily for 2 hours with cramping. Then I stopped. The next morning I woke up & was bleeding again - no cramping this time. Five pregnancy tests reveal a (-) in the window meaning I am not pregnant. I wonder if I am actually though & then I started wondering if it was actually my period becoming irregular because I am starting the stages of menopause. Everything I read says it starts about 35, but if I started my period early in life (not like the usual 15-16 yrs old) then would I be ending my periods early on in life too? I'd like to hold out hope that this is my period sputtering because of a pregnancy & it's just too early to detect the hCG level's yet. But only time will tell now. So I wanted to ask about the perimenopause for some thoughts.

Let me be a bit more clear - sorry if I wasn't earlier. I do know what perimenopause is. I also know when it "usually" happens. I am NOT 35. I am 29. So my question is .. Can it happen BEFORE 30?

Perimenopause, or pre-menopause is a transitional stage of two to ten years before complete cessation of the menstrual period. Its average duration is six years, and can appear in women from 35 to 50 years of age. This has not been a stage of women's lives much talked about, and a woman can find herself experiencing puzzling changes, and not know why. What is actually going on is a gradual decrease of estrogen. The manifestations of perimenopause can vary.