rejecting the boob

my 7 week old kept rejecting the boob today. please tell me this is just a weird thing that goes away. I have plenty of milk. I pumped 5 ounces out and bottle fed it to her. I doubt it was anything I ate. I eat pretty routine foods. I nursed my first until she was 15 months, and I love it. someone ease my mind cuz I'm stressing!