Mama, blood in breastmilk is definitely something to get checked with your doctor ASAP, a few of us had similar scares and turned out okay, but it really varies kung ano ang cause (could be anything from cracked nipples to something else na kailangan i-monitor). Safe to continue breastfeeding in most cases, but your OB/pedia needs to see you first para ma-confirm na okay lang talaga at walang infection or other issue, especially fresh post-delivery pa lang kayo ngayon.