Quoting Juggernog-aholic:" You could have just had implantation bleeding so you may be able to test now."
Quoting Mia Wallace:" implantation bleeding just a few days after sex? didn't know it happened that soon. i tested last night and was neg. but i read you should test in the morning, so idk...."
Quoting Juggernog-aholic:" I'm not sure how soon it happens. but if it was lighter than normal and shorter, that could explain it. And yeah, it's better to test with fmu or after a 3-4 hour hold."