Do I have PPD?

I have my postpartum appointment coming up, and I’m not sure if I should bring up my emotions. I wow who and can get out of bed every morning, and I still have lots of happy moments throughout the day, but at 6.5 weeks postpartum I still find myself incredibly weepy. I’m already nostalgic and sad that he is growing, and the thought of going back to work pushes me over the edge. Sometimes I cry and I can’t quite tell my husband what’s wrong, just that I feel sad. If I have PPD, I think it’s mild, but I’m not sure. This time of year is always hard for me (winter blues if you will), but this year seems harder. I love my baby, and I try to cherish every moment we have together, but seem to have an unhealthy amount of nostalgia for the first two weeks of his life. I even want to put off this appointment, because to me it feels like once it’s over, we are closing a chapter in life that I’m not ready to say goodbye to yet. I hate to be dramatic, but does this sound like mild postpartum depression? I’m a FTM so I’m not sure what I should be looking for. If it is PPD, what it the neat way to manage the weepy-ness and intense feelings of nostalgia?