No period. Negative pregnancy test.

Nicole • 30. Mother to 4 children.
My period is late & I've taken 2 pregnancy tests that came back negative. The first one I know I tested waaay too early. I just tested again last night & it came back negative. I've been having some pregnancy symptoms, I had when I was pregnant with my son, for about a week & a half. Has this ever happened to anyone else? I'm about to make a Drs appointment to see what's up.