So, a couple days ago, on the 3rd, my partner and I had sex. I started to lightly spot afterwards (dark brown/gray color) and continued to spot until the next morning and then it stopped. I am due for my period on the 9th (tomorrow), but I'm not really showing signs of starting other than mild cramping. Is this normal? I know it's too soon to tell if I'm pregnant, but I wanted to see if this has happened to anyone else.