IB help!

Samantha

I had my period starting July 28th and lasting about 6 days to Aug 2nd. the app says I should have been ovulation around the 9th. now on Friday the 18 I started "bleeding". the first day it was brown and pink, the next two days it was more bright red and now we're back to brown. my next AF isn't due until next week......HELP!! WHAT COULD THIS BE? Early AF?