serious things no one likes to admit

Let's talk postpartum depression. Does it start the second you have your baby? A week after? Months after? My daughter will be exactly 2 months old December 5th. I have hysterical crying fits over the smallest things. Honestly it's so embarrassing I cry over the dumbest things. How do I know if this is actually ppd or if I'm just an emotional wreck and need to get over it? FTM here, just needing to see if I'm truly going crazy