well normally i would ask what type of offer and put out the possibility of a scrub. but if your talking after 20 min that's way to short of a time to make any type of judgment.. I tend to watch my stuff like a hawk as well but if your new i'll be the first to say its a bad habit to be in.
think do you plan on running this campaign for 1 hour? or a few weeks? Months? Don't let fluctuations within a 30 minute period tell you if an offer converts or not there is just not enough data. set a budget and at the very least run it for a few hours and at different times of day.
I can't tell you how many campaigns i've built thinking they were duds cause they didn't convert and profit in the first hour only to turn them back on a week later and now i'm still running and profiting from them today and making some tweaks.