Early Signs?

I’m curious to know the early signs any of you have experienced right before you found out you were pregnant! Also, has anyone taken a test after a missed period and have it show negative....only to find out later you really were pregnant?!

To shed some light on this...I’m 4 days late. I took a test. It was negative. However I’m having typical period symptoms (tender breasts, slight headaches, etc.)

would these signs be too early to be having if I were pregnant?

Thanks in advance!