Eh, I get it, confusing gila when you thought dah habis then tiba-tiba ada spotting balik kan! Based on what other mums shared, spotting boleh je datang balik sampai around 8-10 weeks postpartum, especially kalau you just started normal activities like mandi wajib. Your uterus is still healing, so sometimes it triggers a bit more bleeding. Since you're on day 57, quite far in already, the spotting should be light je, not like the heavy flow you had the first few days.
Masih dikira nifas.. maksimum nifas adalah 60 hari.