Finding out baby's sex this early?


I'm seeing quite a few posts from mamas going extra lengths to find out the sex as early as 10 weeks... I'm just curious as to why you are in such a hurry to find out? I'm genuinely just interested in your reasoning. I know it's more "normal" to find out around 18-20 weeks. My hubs and I didn't care to know the sex with our first and won't be finding out this time either as we liked the surprise. I get finding out at your half way ultrasound but why so much earlier than that? Fill me in! ☺️