Best friend an husband are trying

So my best friend and her husband have been trying to get pregnant. She is 11 days passed her expected period, and with her having an "on the dot" cycle normally, she decided to take a pregnancy test today. Let's just say she was disappointed and heart broken again. What are the odds of her just getting false negatives when she really is pregnant? She doesn't feel it's necessary to see a doctor when she believes she's going to be told no too, and I don't know what else to do.