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My first few days it was 3-6%
Okay, I have to ask... how many days have you done this?
It depends on how advertiser-rich your niche is. One of my sites has a very narrow base of advertisers, such that practically all pages in the site share the same ads, no matter what the topic is. On the other hand, another one of my sites is so rich with advertisers that all pages show very different ads. In fact, some of its pages rotate many different ads within themselves.
It's only been up for about 2 weeks
Little point in paying much attention for at least 4 - 6 weeks. You may have earned $$ which google isn't yet showing in your reports - they'll show up later. If you're new to adsense you might be on probation - concentrate on content instead.
When i add new pages i find that CTR is always very low for a few months, then it gradually improves up to my average ctr.