Has this happened to anyone??

Okey Girls,
​I been using Glow for a month and I don't know what is wrong with me; according to Glow I had to get my period on the 13 of this month, but I got it the 20th (a week late) I been discharging brown blood stains in my undies. That means that I have 10 days discharging brown and red liquid. Very little for my normal AF
​Thank you