We did the ultrasound to confirm and an X-ray later.   
If you've been reading and studying since you got her, surely you've come across information that states that puppies bones calcify at day 45, and teeth will show on an X-ray around day 60.   
You can get an X-ray to confirm and count puppies, but not if nothing shows up.... It's a waste of time and money to X-ray earlier and hope to see something. 
Sperm can last 48 hours, and if she was bred over a 3 day period, ovulation could have happened anywhere in between there and 5 days, so you have a window of time that is uncertain for you unless, as myfairlacy said you did progesterone testing. 
I truly hope she does okay if she is pregnant.  My girl is 5 pounds and had trouble.   
The breeder section here on yorkietalk offers a wealth of information.     
				__________________  "You've never learned to live until you've done something for someone for which they can never repay you."~Ralph Hall.         
					
						Last edited by McheleM; 01-13-2014 at 07:39 PM.
					
					
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