Is it worth it to get a 3D scan? Details below please read.

I am 21 weeks & 3 days today with my rainbow baby! (This is my second pregnancy). I am so in love with her even though I haven't met her yet. I want to get it done at 30 weeks or so but, my sister said what's the point when you'll just be seeing her in a few week is she right? I had my last ultrasound at 19 weeks so I just miss looking at her and want to see her features lol.