Almost 6 weeks pregnant and...

Ashley • TTC via IVF after a blighted ovum, ectopic, and husbands cancer.
I'll be 6w on Saturday and I haven't bought a thing or even browsed Pinterest for inspiration. This is my second pregnancy. My first ended in ectopic last year at almost 7w. This is our IVF rainbow baby.
Anyway my point is-people who are also 6w around me are already making registeries and brainstorming nurseries. I just can't. I'm too scared to get excited and start planning. I hate that I feel this way.
Any advice? I'm hoping once I see proof that there is a baby in there (next week) I'll feel more at ease, but for now I don't feel pregnant at all so I'm just scared.