Have just googled them and can't find out whether they normally show a shadow of a line, even with a -ve result. The last ones I used did, so I'm wondering whether it's that as have just had the faintest of faint lines.
I've also started spotting but as I normally get implantation bleeding when pg it doesn't help to solve my dilemma!
Any experiences very welcome!
Thanks 
ps I got the tests free with an order from Access Diagnostics.