When did you find out you were pregnant?

Angie
I'm only 19 years of age, never been pregnant before and myself and my partner have found out we are expecting! I'm due on the 18th of February, 2017 which is my own birthday!! 
Before I missed a period, about a week and a half before, I had a feeling that the cramps I was getting and the moodiness wasn't that I was due for my period, but I had a strong feeling that I KNEW I was pregnant. Surely enough, 4 days before my missed period I took a test. And even so it came up so dark and quickly that I'm pregnant! :) I just want to know if any other mummies or mummies to be knew before hand or found out later in their pregnancy!