General indifference?

I'm 31 weeks pregnant but I don't feel like it's real to me yet. I had a boy at 16 but gave him up for an open adoption. We're close and talk regularly but during the pregnancy, I kind of distanced myself since I didn't want to get attached and break his mom's heart if I chose not to go through with it. Do y'all think that has affected me this time around? I get excited on occasion (when complimented or shopping for my baby girl or when she kicks sometimes) but I don't feel like it's really hit me yet. Anyone else going through this or able to give some advice? I'm sure I won't feel like this when she gets here but I can't help but worry.