I've definitely had better results the longer I hold off going to the toilet before testing - 3-4hrs, if possible, definitely gives better results.

I've also experienced different results when I've tested with different brands using the same urine sample, which has been confusing.

Incidentially, has anyone else had problems with the Confirm brand?? This month, it gave me 4 days of positive results, whereas when I tested with the other brands I pretty much only got one day of positives with those brands. Even yesterday, post ovulation, the Confirm test was giving me a pretty dark test line. Maybe 90% as dark as the control line ...

Just interested to hear your experiences. I'm too scared to use the Confirm HPT now for fear it too will give false positives!