Did you know if you were having a boy or girl?

I had an ultrasound at 16 weeks and the tech said it’s a boy! I’m so surprised i thought it was a girl. It’s this strange feeling because I’ve always wanted boys and I have one already. I’m so thrilled to be having another son but I keep feeling like the baby is a girl. I was certain my son was a boy from the beginning. I’m excited to prepare for another boy but when I go to buy stuff I feel like I shouldn’t because it’s a girl! So confusing! Anybody else ever feel this way?