I felt exactly like this before my 20 week scan I really wanted a boy and the thought of being told it was another girl terrified me, I spent weeks feeling anxious and even tried to convince my oh to stay team yellow. If it's just other peoples reactions your anxious about, just make a massive deal out of how excited and happy you are its another girl if that's what your baby ends up being. You'll find that people will still make comments if it turns out to be a boy you'll end up with everyone saying 'you must be so happy your getting a boy after 3 girls' 'this will be your last one then now that you have a boy' 'oh so you's did it right this time' (yes I actually did get that last comment off someone like we'd have got it wrong if we'd had another girl)