Poop stringy and now with a lil blood

Shatie • Mother of two boys 18 and 16 👨‍💼👨‍💼expecting my princess, 💝 due Aug 18, 2019

My baby is a breastfed baby and the past few days I have noticed my 3 week old poop has been stringy. I looked up what it can be from and it said it could be an infection, allergies or constipation and if it has blood in the poop then it can be very bad. Well we see a lil blood in her poop and it's still stringy. Is this something I need to go in to ER for rigjt now or wait till Monday to call the Dr?