little help please

how long does it usually take after you find out your pregnant to feel a connection to your child? or even for it to register that there's actually something there? also has anyone ever just not cared if anything happened with their pregnancy before their first ultrasound? im not trying to sound like a bad mom even though i feel like one and my child isn't even here yet just this is my first pregnancy and it doesn't feel like i thought it would or even like you see everywhere im so used to seeing pregnant women so excited and happy and then there's me just trying to figure out when i'll actually have a connection and care like i should.