I had what I thought was a period but now I'm very unsure. It came the exact day (12 dpo) how ever it was WAY lighter. I always have 5-7 day, very heavy periods. This was very little blood, more than just spotting though and it was barely four days. It feels way too long to be implantation bleeding but I'm just trying to find a reasonable excuse for this happening. If anyone has experienced this or has any idea that might help please do share. Thank you!