Is this rude?

I was purchasing a pregnancy test at Walmart and my SO and daughter were there next to me. The lady checking us out picked up the test and says "happy?" I said "yes" and she said "do you think you are?" I said "not sure." 
I found this extremely rude as it was none of her business whether I was "happy" or not to be buying the test. Just wondering what others opinions are. 

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