am I pregnant even if my test say negative

Valencia
So my period is late and me and my husband are trying to conceive but recently we had no lucky hopefully this time is the charm I have these symptoms 1. Nausea through out the day 2.back pain. 3.noticed I have grown out of my bras and 4.my period is very late. The obvious thing to do was take a home pregnancy test. But It came out negative is it possible for the test to be our can this be caused by something else