When did you feel a connection?

I'm 15 weeks and I don't really feel a connection to my unborn baby. My pregnancy was planned and I'm excited to actually have a baby but somehow I just don't feel anything. Does that make sense? I'm not really even interested in hearing the heartbeat and having ultrasounds. I just have to pretend so that the midwife doesn't think I'm crazy. Maybe it's because I've been so tired, nauseous and achy? Is this normal? When did you feel a connection? I'm not even sure I know what it would feel like to have a connection. We even have a name picked out already and know it's a girl.