BREASTFEEDING NEWBORN. I give up😭😭

I've been up 12 hours now and baby will not settle, I don't think she's getting enough milk or latching properly.
I expressed some milk into a bottle and she took it straight away no problem.
Can I combi feed or just express? I'm so stressed she isn't getting enough. Plus she's only done 1 poo nappy today.
She's 3 days old :)