If your bleed (aka period) was IB you would test positive by now, for sure no doubt. The lines you are seeing on the tests are indents, they will always be there... I used to see them all the time on mine too but I can tell the difference, it's obvious. The opk look spot on for cd10, it isn't dark at all...The rash is unrelated, it's probably contact dermatitis due to an allergy and it will go as quickly as it came (most weird things usually do, I've had a few myself). One question though, if you know there is no chance of pregnancy as u previously just stated then why are you testing thinking you may have had implantation bleeding? I'm confused. Do you honestly believe in your heart that you may be pregnant? I want to offer helpful advice but honestly I'm really not sure where u are going with all this....