I had my period on the 24 june and then i had brown discharge on the 27 july and 28 july and i have stomach aches that comes and goes i am premeno?

Perimenopause: This is a "state of being" that takes a few months to determine. You may just have an irregular period and then it will go back to normal. Or you may (likely) be going down the perimenopause path. Often periods get closer together and then they start dropping out. You will sometimes get hot flashes, difficulty sleeping, night sweats, moodiness. Keep a diary to know exactly what is going on

Possibly: At your age ovarian function declines. Ovulation is still possible but will probably not occur regularly. You can see you GYN for a test called FSH to determine if you are menopausal. There seems to be a several year window where periods are still irregular, and ovulation may or may not occur, but menopausal symptoms such as hot flashes do occur.

Maybe: You need more cycles. Peri-menopause is associated with a change in cycle and flow. But other items in life can cause such a change, such as stress. You will have to see what the coming months bring.