is it my first period?

On july 5th at night i went to the bathroom and there was like a brown discharge. i googled it and it said that this is most likely my first period. i’m 14 (15 in november), i’ve had discharge for about 3 years now and i’m a bra size 34AA. i told my friend and she thinks it’s my period. it hasn’t stopped yet and it’s brown and sticky and has some clots. is it my first period?