Hi Rachm,

I have used 1st Response and did the test in the afternoon the day before AF was due and they worked a treat. Maybe it is just to early for you. Wait a few days then try gain. I find them really accurate and I actually brought a box of 3 last week of Ebay for $5.00 which is really cheap. Just waiting to be able to use them. Good luck to you.

xxx Nita