Not feeling connected to baby

I'm a little over 31 weeks and I am super stressed with my job and in law issues and thinking about what's going to happen after baby gets here. It just hit me today that I don't really feel connected to my baby. I'm happy when I get an ultrasound and to see that she's growing and healthy but I just don't feel a connection to her. Do some moms not feel a bond until they meet their baby? Is this a common ftm thing? I want to love her and I want to be a great mom but emotionally I'm not there. Physically I am not feeling great, morning sickness is back, I have pubic symphsis disfunction, I can't get a good breath of air, sleeping isn't great, maybe these symptoms are affecting my mental state. I'm worried that by feeling unattached now will lead to PPD after she's born. Am I alone in feeling this way?