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How do I know is my mated pug pregnant or not?

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My almost 3 yr old pug was mated february 8, 10, and 12, 2010. Her nipples became bigger after 2 weeks and we hoped and treated her as pregnant. However, it's already over 30 days now but there's still no increase in the size of her belly. Her appetite increased but I noticed she also became thinner. She threw up last 2 days during the mornings, which is unusual. So we really do not know if she's pregnant or not. It's our first time to breed a pug. I want to have an ultrasound exam or xray but I want to know if results will be very accurate? Thanks!