I am 26 yrs old, planning for a baby. Last period was on 3rd nov 2012 and currently no period as of today, had sex on 20th, 21st and 22nd nov. Is there a chance of me being pregnant? Two pregnancy tests negative as on 3rd dec but no periods. Please advise.

A little early to test still, really need to wait till at least a week ( 10 days are better) of being late.
Wait till then and then retest.