The first two years

Cindy • I'm 34, SAHM to 3 year-old girl and brand new bouncing baby boy!
New research claims that the first two years of raising a child is more stressful/traumatizing than unemployment, divorce or even the death of a partner or parent! 
I wonder though, does that clock start ticking at pregnancy? Because I'm feeling pretty miserable right now :/
Can't wait for 2nd trimester!