I really feel you on this, being a first-time mum and seeing unusual poop is so worrying. Since it has happened twice now and the second time looked like constipation, it would be good to bring her to see the PD just to be safe, so they can check if her diet or digestion needs any adjustment. Bring a photo of the poop if you can, it really helps the doctor see exactly what you are describing. You are doing the right thing by paying close attention, hang in there mama.