Early august i got a brain scan with contrast and came back normal...is it possible that now 2 months later tumor developed?

Not likely: Unless you have a history of a previous malignancy, not likely.

Anthing possible: but 1) while I do not know much about you, I assume that you had an indication for the (NEG) scan. 2) http://www.cancerresearchuk.org/cancer-info/cancerstats/types/brain/incidence/uk-brain-and-central-nervous-system-cancer-incidence-statistics#By2 about the lowest risk age group. The more common (slow growing, NON-mailgnant) type is most likely to show up (meningioma,or pituitary)