I can't help but laugh at this because for the last two months I have been too impatient to wait until I was due to get my period to take a test. It's like watching paint dry waiting for that period!!! I think I even took a test a week before I was due to get it last month. Everyone told me it was too early, but WHAT IF!

...and yes, I'm spending a fortune
First Response says it can judge up to four days before your period, so I guess it all depends how anxious you are. Although, my friend tested early and got a negative...then retested 5 days later and got a BFP! I guess it all depends.
I'm due to get mine on the 25th - I bet I'm testing my the 21st
Good luck!!!!!!!!