Postpartum depression?

4 weeks PP and I am still crying every day. We have had a really hard time with breastfeeding and are just now starting to get our groove, so I thought my tears were warranted bc things were so stressful. But I'm still feeling sad for a couple hours of the day even though things have improved. I've taken the PPD quizzes and they say I am low risk. I am still laughing, enjoying things and love spending time with baby, so is this just extended baby blues? Has this happened to anyone else?