Week late..

okay so, i've been on birth control for 5 years. two years ago i started a new birth control pill where i only have my period every 3 months. yes i've missed pills here and there but have never been late for my period. i've been seeing this guy for two months. we waited almost a month before having sex. we use condoms every time. i was supposed to start my period christmas day. and here i am a week later and still haven't started. i've taken three tests within the past week and they've all been negative. could i still be pregnant ? just too early to tell with a urine test?