I did also in the beginning. I haVe a 2 year old and I wasnt really expecting it plus I was having relationship problems at the time so I really felt terrible. But it passed and everything seems to be falling perfect..I cant even wait now:)
Its probably just because youve already been pregnant and know what to expect and have other things taking up alot of your attention. Im sure once you see the baby on ultrasound, hear the heartbeat, and feel the kicks youll feel more connected and more excited :)