Hi mama! Normal lang yan actually, lochia can go back and forth between colors, especially if you're doing more activity or lifting stuff, kaya don't worry too much. That said, since you're 3 weeks post-CS and it went red again, best to check with your OB just to be safe na everything's healing properly, lalo na with a surgical delivery, they'll know what to look for better than us. Usually lochia lasts around 4-6 weeks total pero sobrang varied talaga depending sa tao, kaya talagang mas better peace of mind if you ask your doctor directly para ma-rule out any complications! Kaya mo yan mama, first recovery is always the scariest