No period

My period was supposed to start last saturday (the 10th), and I still have not had it. I also have not had any cramping or spotting. My fiancé and I have been trying for a year to get pregnant. I took a test Sunday and it came out negative. My periods have been pretty much on spot with all the dates on here that say when they should start(give or take a day or two). I don't know if I should wait and take another test or call the doctor as schedule an appointment and tell her we've been ttc because I haven't told her. Any help appreciated!