No period but negative tests.

I was supposed to start my period today and I haven’t yet (I know there is still time in the day and I’m not very late regardless). Im not as focused on being late as I am on the symptoms I’ve been having! Mild cramps on my right And left sides, dizziness, and congestion. The symptoms seemed so prominent this month that I just KNEW I was going to be pregnant, but I’ve had all negative tests. Maybe I’m grasping at straws but has anyone had negative tests this close to getting their period and then later found out they were pregnant??