Hi

I think the little embryo implants around day 7-10, so there should be a chance after 9-10 days that implantation has happened. A "normal" LP is 10-19 days (or that's the longest "normal" length I've read, though a lot consider 10-16 or 10-17 days to be more normal) so 10 days isn't a worry. Hope this puts your mind at rest a little bit.

Ryn.