Congrats on your little one! A few mums I know have gone through something very similar, lochia settling down, then bright red spotting returning around weeks 5 to 7, and it turned out to be their period coming back rather than anything alarming, especially if they weren't exclusively breastfeeding. That said, some mums find it harder to tell the difference because lochia itself can come and go in waves, so the timing and whether it picks up or fades off over a few days is usually the key clue. Since you're already on medication from your doctor and still seeing bright red spotting on day 9, it's worth going back to your doctor or an OB-GYN to reassess, because nine days of bright red is on the longer side and deserves a proper check rather than just waiting it out.