Scared to get pregnant(advice)

My SO and I have been ttc for the past 4 months. We have become th been very excited and he is so wonderful. I have always wanted a family, but recently I've been feeling the opposite about it. Even today when I went over to a friends house to see her 3 month old and I kinda felt uncomfortable holding her. Does this feeling go away? Any ladies out there go through the same thing????