Implantation dip

I’ve noticed a dip in temp at 7/8 dpo that I’ve never had before and I started reading about the implantation dip. I realize it’s not a true indicator, but there are studies showing that it was seen in more pregnancy charts than not. I’m just curious who else noticed a dip and ended up pregnant? And when did a test show it? I had a missed miscarriage almost exactly a year ago and had a uterine polyp removed last month so I’m hopeful since I’ve never seen a dip before. I had a dip right before ovulation and then at 7/8 dpo and it was back up the next day. Currently 9 dpo.