Why am I still bleedingggg

Serena

So my period is usually consistent but when I came back from the beach on 6/12 it started a week early which I didn't really think was a big deal. Then like a week later on 7/13 it started again. So I just assumed that this was because of stress but I'm sTilL bLEeDinG and I don't understand. (ok kinda gross... but my flow is kinda weak and brown like idk)