Pregnancy test

So my fiance and i have been trying fir 3 months now and norhing but the last few weeks i feel pregnant and i take a clear blue digital every week and i watch that screen the hole time well it did something weird this week the little book down on the bottom left kept blinking and the 1 and 2 kept flaahing but then it came up negative :( is that a sign that maybe i am it just still to early or just a weird test and im really not preganat ideas???