Implantation spotting?

Today, I’m 5dpo. Had an iui Thursday so I know I’m 5dpo. This is my 6th. 3 have worked, but all ended in early miscarriage. So when I was going to the bathroom this evening, I wiped and saw reddish/pinkish blood on the toilet paper mixed with a lot of clear cm. It was only a tiny bit and I wiped 3 times and it was gone and that’s all I’ve noticed. Could this be implantation spotting, I thought it was too soon but not sure. I’ve never experienced this before so I’m hoping it’s a good sign that the embryo is burying deep!! Please let me know what you think!!