have anyone ever felt pregnant way before the test and/or missed period? explain to me please.

Lequesha
I have two kids. With my first one I didn't know I was pregnant until I missed my period. Didn't feel any other symptoms until I got further along. With my second one, I got this sick feeling in my stomach like 2 or 3 days after we did it , and I felt that way up until I took a test 2 to 3 weeks later and it came up positive. Now that we are trying for a girl this time, we did it a couple days ago , yesterday I got this sick feeling out of nowhere at work.....I'm just curious to see if anyone else had experienced this before.