3D gender ultrasound

I was told my baby’s gender at the regular anatomy scan at 20 weeks and I also had a 3D ultrasound at 22 weeks which they confirmed the original gender which is a girl! Is it normal that I worry that it’s wrong? I’m now 30 weeks and I have this irrational fear that my baby is going to come out a boy! Not that it matters but I have just gone a bit crazy with the room and buying baby girl things lol anyone else feel this way?