Sayang, since your specialist has already checked you and confirmed everything is okay with the baby and placenta, that's actually good news, try to trust that assessment first, okay? I know it's scary lah, spotting macam tu memang buat worried gila, but your doctor gave you clear guidance, just wait it out for a few days and it should stop on its own. A few of my mum friends went through similar scares mid-pregnancy and the spotting just resolved naturally, so you're not alone in this. About the medicine, please ask your specialist specifically which uterine tonic is safe for you at 20 weeks before taking anything, even the one you already bought. Don't guess-guess with meds during pregnancy, ya. If the spotting gets heavier, you see clots, or you develop pain or dizziness, go back to the hospital straight away, jangan tunggu. Hang in there, mama.