15 week picture and doc said boy. Now 21 weeks and ER tech says girl

Please help if you can. No rude comments please.
Doc told me at week 15 boy and he wouldn't say for several minutes cuz he wasn't sure. Made it 3D and said BOY! Now weeks later the ER tech tells me girl and I already have all I need for baby. :( here is the 3D 15 week picture!