Hi mama! Yan talaga ay concerning lalo na kung 16 days na ng spotting, honestly, mas safe na mag-check ka na sa OB mo kasi hindi namin ma-pinpoint kung ito ay normal side effect ng expired injection or may ibang nangyari na, especially with the dark red color pa. A few of us moms have had irregular bleeding after injections din, pero pag ganyan katagal talaga, kailangan ng professional check para ma-rule out kung walang ibang issue, okay? Wag mag-alangan na mag-schedule, hindi pa late yan sa body mo but better safe than sorry talaga.