Late period, negative test

just looking for some advice! my last period 12/5/17 came a day early and was very light, there were also no clots(Sorry for detail). I assumed this was my period but panicked a bit as I knew it's not like my normal one. My period this month was due on the 9th of June and is still not here. I've tested 3 times all in the morning and they have all been negative. Could I be pregnant? I am usually right  on time and have never been late :-/