Crying in front of my 4 month old? Does he know that I'm upset?

I've been under alot of pressure the past few weeks for financial reasons, my fiances job may be in jeopardy because the company is laying off quite a bit of people, we're really struggling financially as well as trying to plan our wedding thats two months away and having difficulty with our families because of it. Family dynamics come into play and people aren't being as supportive as we'd like right now. I'm also going back to work part time in a few weeks and I'm really dreading leaving my son. I'm having such a difficult time emotionally and today I broke down and cried my eyes out.... when I looked up I realized my son was awake and watching me cry looking up at me with sad little eyes so I went in the other room and got myself together but now I feel so guilty for letting him see me like that. I don't want my baby to feel this negative energy. New Moms does the pressure of life ever get to be just too much and cause a little break down?