Implantation bleed?

Ali • TTC 1st baby. MMC 12/10/15 👼🏼
My period isn't due until Sunday. I've had really bad nausea the last 3 days and this morning, after a bowel movement (sorry tmi) I had a brown watery discharge/bleed. Only on the tissue-  had nothing since. Could this be implantation bleeding? Would really like to hear from people who have had implantation bleeding?!