How early can you catch on that you're pregnant? What are are signs and symptoms to look out for? Whats the earliest sign to notice?

in case of my first baby, we found out in the 5th week. in case of my second baby, we found out in the 2nd week!!!! i think the earliest signs are tenderness in your breasts and a weird queasy feeling. these are the earliest signs, even before you miss your periods.