Toni is about 10 weeks pregnant and is having dinner with her sister, kristy, who happens to be a psychology student. the sisters are sitting at a mexican restaurant enjoying chips and salsa when the waitress asks them what they'd like to drink. kristy orders a beer. toni turns to kristy and asks, "one beer isn't going to hurt, right? " kristy is not only aware that toni is pregnant, she is also knowledgeable of teratogens. what should kristy say to toni?