Could it be?

My period isn't due for a week. Yesterday I had a tiny spot of rust colored blood. After that it was so light I only saw it when I wiped. 
​Then it kept on for a few hours. Today we BD'd and few hours later I was wiping and up inside me when I wipe there's tiny pink. It's ridiculously light. 
​But I'm worried it's not implantation because it stopped and then now it's back. I mean I didn't have it all day. But now I do.. Like I said it's so light it's barely noticeable.