I am going crazy!

I am only 6 days post ovulation and not due for my period until April 13.  I had a Clearblue digital laying around from last month and decide to try it, even though I know I am super early to be testing, and it came back positive, I couldn't believe it! So I went out the next day and bought a Clearblue digital that estimates the weeks and it came back not pregnant. Did I get a false positive the first time?