Heavy brown stuff the day after my period?

I had unprotected sex on June 20th. He didn't cuum. The only thing there was a little bit of precum. I was really stressed last month so that could be the reason my period was late. I was supposed to get my period on June 17th but I got it on June 27th. It was a normal heavy period with cramps that I always get around my period. Yesterday I realized I had a lot of heavy brown stuff on my pad... When I went pee, red stuff came out (period). But today when I wiped, there was a lot of this brown stuff and no period blood. I usually get light brown discharge after my period but this stuff was dark brown and heavy. Is it normal?