Flying in first trimester

I have a long haul flight (12 hours) booked in a couple of months and I'm worried. It's all hypothetical ATM but hear me out - we are TTC #1 and if I have fallen pregnant this cycle I'll be around 9 weeks when I fly. I've been doing a lot of research and opinions are split - though professionals say it's safe, some women have posted saying they miscarried shortly after flying. And from what I have read, it's domestic flights which seem to do the damage. I'm a bit worried now - I had a MMC 4 month ago and if I do fall pregnant it'll mean flying within my first trimester. Reaching out to anyone who has flown in their first trimester - what were your experiences?