I’m confused

So I got my AF June 15th the app said my fertile window is between June 27th and June 2nd I had sex the 24th 26th 28th and the 30th my AF is not due until July 16th but today July 9 I went to the bathroom this morning and there was blood I wiped and put on a pad I went to change it later and it just had brown spots on it and now nothing but I’m cramping. Could it be implantation bleeding or AF is coming a week early which has. Never happened help me please