Gender ID - boy or girl?

At 18 weeks, the ultrasound tech said she saw our baby's "sticker" and was certain it was a boy ("18 weeks.jpg"). Today, at 21 weeks, a different tech said she couldn't verify it was a boy and, in fact, felt strongly that it was probably a girl ("21 weeks-1.jpg" and "21 weeks-2.jpg"). Can you help? [I couldn't upload the photos, so here's a link to them: https://www.dropbox.com/sh/2z8zwxko5w2gwsf/a7pxFchH4S ]

 Oh man. Those pictures are all pretty murky. 2 & 3 look more like girl parts than the first one (which doesn't look either boy or girl). If I were you, I would try to go for an elective ultrasound from one of the baby places. They're cheaper and easy to get. I wouldn't feel comfortable, with those being my only pictures, starting all my shopping just yet. Shame they are so difficult to read.  

looks like a girl to me. 18 week scan does not show any boy parts to me ! congrats

I'd plan for pink.  I have no idea what the tech is pointing to in the boy parts pic. 

Thanks for your replies so far. Could anyone help me out with pics 2 & 3? I can't even tell what I'm looking at. Are these bottom-up shots (do you call these "potty shots"?), or from the sides, or what? Thanks all!

I can only see one pic...looks girlie...

I couldn't get all the pics into the post. Check them out here: https://www.dropbox.com/sh/2z8zwxko5w2gwsf/a7pxFchH4S The first one is the 18-week picture, in which the tech was certain it was a boy. The second two were at 21 weeks, and the tech thought girl but wasn't positive.

The last 2 looks like a girl. Can't see anything in the first one.

Looks very girly to me!