Congratulations Promis, but could you report back in three or four weeks time if your site is still ranking? Many of us have witnessed a temporary ranking effect immediately after sites are indexed but the sites usually bomb after enjoying a week or two of good results.
Not in my experience, I have launched several sites both "aggressively" and non-aggressively during the last year and a half and they have all been sandboxed.
Well perhaps from the very first day but anyone planning a website properly should surely have some sort of plan in place to get links from other sites. Isn't that what the Internet is based upon? I would say that this is very natural behaviour.