I generally have a 26-27 day cycle. I had US on the 13th or 14th day of my cycle (depends how you count). It's now the 28th day, and I have a weird discharge. Normally my period starts in the morning of the 26th day, and by the 27th day increases to a very heavy flow. Instead, I had nothing at all on the 26th day. On the 27th day, I spotted a little bit of brown in the morning, then nothing more until this morning, when I've been streaking brownish-reddish all day. As the day wears on it's getting more pinkish, but I only see it when I wipe -- nothing on my panties yet. Does this sound like implantation bleeding, or is it just a weird period?