I would ask if you think that you are going to spend the extra weeks stressing over it? If so, I would ask in the next couple of weeks. stressed so much over it because I didn't ask for a potty shot so had to just go on her word. I do think the nub shots are not 100 percent at all. There was one person who posted today for her friend I believe and it looked like such a perfect boy nub and it was a girl. But at 16 weeks I think it's very accurate if the equipment is good. I don't know what to say.. I really was super upset to hear that this baby is a boy.. I love my boys.. They are 2.5 and 4 and super wild and silly and just amazing.. but I do really want the experience of raising a daughter too. Having all of one gender, be it boy or girl is hard because you know you are missing out on what it is to have one of the other as well. Raising each child is a different experience from the other, but it's even more so when they are different genders. I think for me it's a very large picture thing.. and esp going into adulthood. Although, I can't control any of the relationships I will have with my kids I do know how close I am with my mom.. and I also know how the extreme opposite my dh is with his.. not to mention, I can't stand my mil.. and I shutter to think I may only have that x3! So, with everything you've been through.. to have had a daughter and lost her in pregnancy, and already having twin boys I think it's natural that you care what your baby's gender is. It's natural to want to have a little gender balance. It's hard for people who aren't in your shoes to understand though.. that I have found out for sure by talking to a few people openly about how I feel. I hope that you hear girl. I really do.. and if this is a boy, maybe you can be open to trying again.. you did afterall conceive a girl totally naturally, it may happen again. I feel like my dh and I may only make boys.