I would say wait 2 week at minimum. This gives time for significant changes so you're less likely to run into maybes and percentages. I can't think of anything worse than decorating super girly and for that bundle to be a boy.
Seriously? Hopefully just a poor choice of wording, but I can think of plenty worse things.
OP, unless you're dying to start registering and/or decorating right away, I would honestly wait till about 30 weeks for the elective one. That way instead of spending money on just a second opinion sex determination, you're also getting to enjoy your baby in 3D/4D (they look much better this way the further along you are). Just because the doctor (and it was likely a tech, not the doctor, and you may not even get that same tech) was wrong in this one case, doesn't necessarily mean they are crappy at determining sex. Whatever answer they give you, accept it for now, knowing it can always be wrong (no matter where you go) and then get confirmation at 30 weeks. It would still be plenty of time to change your registry items, and you can wait to do any major decorating until then.


My Pregnancy/Parenting BLOG TTC since 5/2011, BFP #1 12/3/11, M/C 12/7/11 @ 4wks 2d. Began seeing RE Sep 2012. October 2012 Metformin 1500 mg= ovulation on CD34 BFP#2 11/14/12 9DPO, EDD 7/26/13, DX Gestational Diabetes @14 wks, our angel born sleeping 3/24/13 @ 22wks 2d. BFP #3 7/4/13 8DPO EDD 3/22/14, DX Gestational Diabetes @14 wks. started insulin @16 wks. Our rainbow, born 3/19/14 @ 39wks 6d., we're so in love!
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Re: How long should you wait between ultrasounds?