My period came yesterday but it is so light. It's never been this light before. There was some bright red when I wiped and some in panties. Then the rest of the night there was hardly anything a little dark red. And it has been that way today. Today is my second day and is supposed to be the heaviest day. Mine are 3 days. I have some cramps like I usually do but there not real bad. Me and my bf have been ttc but I figured it didn't happen bc I got my period. I took a test today bc it is so light in case and it was neg. Could this still possibly be implantation bleeding? How long would it take for it to show up pos?