When did you find out the gender?

I’m 15w 2d. I was supposed to find out tomorrow but got a call from my OB saying i have to reschedule because it’s too early. I can’t believe they scheduled me this weeks ago and are telling me the day before! They knew my due date the whole time. I had to request tomorrow off a month ago. Am i overreacting? I was looking forward to finding out before Christmas/my birthday now i have to wait another 4 weeks!

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