First time pregnancy anxiety

My husband and I have been trying since June 2020 and finally got our first positive a week ago. I thought this is what I wanted but now that it’s here, I’ve just been having so much anxiety and depressing thoughts. Not sure I really wanted to be a mother or if I was just trying to please my husband and society bc I feel like it’s what I was supposed to do. I am so scared to be a mother and somewhat feel like I just don’t have the motherly instinct like most. My sister has two daughters and I love them so much but they are the only children I’ve ever wanted anything to do with bc I’ve just never been huge on kids. I really don’t know how to feel. I’ve been crying on and off constantly. I feel like this is supposed to be such a happy time for my husband and I but it’s like I can’t be happy. We’ve told our parents and I just get so aggravated and anxious anytime one of them mentions it or wants to talk about anything pregnancy or baby related.