Blood in breastmilk+ newly pregnant

Hi! Also posted this in r/breastfeeding but it’s a 2u2 issue and I’m panicked so I’m posting here too! For context, l'm breastfeeding my 9 MO and recently found out I'm pregnant (6w today). A majority of one of his poops yesterday was red, so I freaked and called his ped and she said it could be from my breastmilk and if it continues I should come in, but that it's not generally a big deal. Does anyone have experience with this? I'm trying not to freak out but I don't want to be feeding my baby blood. Is this related to pregnancy at all (even anecdotally)? Thanks for all the words of wisdom!