Late period, negative test

C

So my period (usually very regular) is 14 days late. I took a test this morning, and it's a clear negative. I'm experiencing early-pregnancy symptoms (tender boobs, enhanced sense of smell, threatening nausea). But, these are also my usual PMS symptoms. My plan is to wait another week , and if my period still hasn't come, I'll take another test. What do all of you think? Did I conceive late in my cycle and just tested too early?