Google issues

Hy guys,im having some problems with my site.

The domain is new,been doing links to it for about 3 weeks.

At first i was hovering arround spot 50 for my main KW.

Then all of a sudden i hit number 5 for 2 days.

Now im slowly falling back to 50 again.

Is there a sign of a problem from google ?

My site is a WP site promoting a CB product,only white hat seo so far,ezine links,profiles and high PR from some buddies.

Thanks in advance

Just wait and keep building backlinks. Rankings always bounce up and down when you're building links. If you were penalized, you would be banished from the serps entirely.