So confused! CM stretchy/yellow in color

TTC after miscarriage in September , my AF is due today CD 30. I’ve been cramping on and off so I figured she was here. After I used the bathroom and wiped my CM was legit dangling from me, stretchy with yellow in color ( no scent) . Which makes absolutely no sense. I’ve used opk to determine I had my surge at CD17, I’ve also taken hcg tests all indicating BFN. Has anyone been through this and somehow ended up pregnant????