B.C.
You officially hit menopause once you've gone 1 whole year without having a period.
What you are having now is most likely peri menopause - which is a period of increasing unpredictability and it can go on for 10 to 15 years before you achieve full menopause.
For me, I knew it was peri menopause when I had my first hot flash.
Hot sweats at night weren't any fun either.
For a long time my periods were normal, normal, short, normal, normal, long, normal,skip, normal, normal, long, etc.
You still need to use birth control - as long as you're having period at all it's still possible to get pregnant.
Toward the end my hot flashes seemed to finally go away and I went 9 months with no period only to have one and I had to reset my count and wait a whole year before I could have my menopause party.
I finally got to full menopause last Dec (I'm 53) and I'm thrilled to be done!
You should still have your annual exam so you can wait to ask any questions you have until then.