Hi Bojan! Well done, that's certainly the nova! With all the cameras that are aimed at the sky these days, it's a wonder more pre-discovery images don't come to light (actually that's the problem I think, they don't come to light!). I snagged one last year, N Oph 2008 No 2, about three days before it was discovered, only of course I didn't know it was there till later!
I've attached your pic with the nova marked, for those who aren't quite sure which star it is, and a shot of mine taken a day later than yours (10:00, 27 Oct 09 UT). Clouds here too...
Cheers -