Hi all I'm new here never posted before but just wondering if anyone has experienced "old blood" in their cycle? Im due to start meds soon for ivf and I'm unsure of when my day 1 is as I always have dark/sometimes black blood at the start of my period. The fertility nurse said its old blood and I should count day 1 from when I see fresh blood. Has anyone else experienced this? Obviously it's critical to get the dates right for start of treatment so any advice greatly appreciated. I also have quite a lot of mid-cycle bleeding so I'm a bit all over the place!