Didn't know where else to post 😬

So AF was supposed to start on the 20th of October but never showed and I got what I thought was a faint positive on a clear blue test last Wednesday (I know blue dyes aren't recommended but they were the only ones I could get) but about maybe 4 days ago now I've had some brown with a bit of red but it's mostly brown spotting not enough to fill a pad maybe a 10c coin size worth every time I go to the bathroom, it hasn't gotten heavier like I thought it would because I thought it was my period and I'm not trying to stress myself out whatever happens happens but I've never had brown spotting last as long as it has without turning into AF. I've also been experiencing back pain for the last 4 days and today it's so far been okay but this morning ive had like a dull ache in the side of my boobs and have been a bit bloated and I was having period like cramps on Saturday and I was sure AF was coming but hasn't showed, can anyone give me some insight please 🙂