TMI brown blood prolonged ??

i havent had my period since late september but this month id been experiencing my usual period symptoms (mood swings, bloating, acne) like a week ago without getting my period. about two days ago there was that sort of brown blood you get when your period is ending? it’s only very light and i only really need a liner on. this has happened before in the year when i missed my period for a month or two (it’s usually pretty irregular, i’m a young teen and i’m not on birth control or anything) and then my period was regular from then up until september. is this a normal thing?