update

So I’m 15 days late now, yesterday had some brown discharge in my underwear but not enough to see through the other side of them. It was light a very light brown. Any ideas on what it could be? Here’s my days I had unprotected sex and he came inside me ( red was my last period which lasted 6 days) also I am not stressed out on anything and my periods are always spot on!!. I had gotten my blood tested july 3rd but it was negative but they also said it could be to early!. I’m just I’n confusement!. My boobs are very sore and tinder too.