Aiyoh, lambat period after C-section is super common lah, especially if you're breastfeeding! A few of us mums had this, one friend's period didn't come back until baby was almost 6 months, another one even longer, so don't worry too much. Since you're not on the pill and you were intimate last month, I'd say just do a quick pregnancy test to put your mind at ease, then see your gynae if it's still not coming, they can check if everything's okay down there after the surgery. Stress and hormones from breastfeeding also affect the cycle, so it really could be normal for you right now, but better safe than sorry lah!