Could I still be pregnant with a BFN?

Okay, so I'm always on schedule with my periods. Always within a day of when I'm supposed to start. Well, here I am, 3 days late, and no sign of my period. No spotting, no cramping, no sore boobs. I have been TTC for 10 months now so I tested at 2 days late and got a BFN. I am now almost too scared to test again in case I get another one. I do have pregnancy symptoms like my last pregnancy. Bad nausea, really bad bloating, diarrhea, headaches. Maybe I am looking too far into it because I have been trying so long? Maybe it is just a random late period? Is it possible to be pregnant and still test negative at this point? Thanks in advance :) and please, oh please, send me baby dust! We want a baby so badly!