No period. Negative pregnancy test!

I was suppose to have my period Sunday 14th. But it never came. I have all my normal symptoms such headache, bloating, flatulence, even my mood had been kind of funny. We have been trying to conceive since February this year, and for the last 5 months by periods have been right on time. I took a pregnancy test yesterday morning, and results were negative. 
​What should I do? Did I take the test too soon? 
​I appreciate your input .
​Thank you