14 dpo negative test

App says I’m 14 dpo today, took a test and it was negative this morning. Have not had any of my usual PMS symptoms (typically have severe cramps, headaches, extreme moodiness several days leading up). Period is slated to start today and the app has been accurate within a day over the past several months. Boobs are feeling sore for the past week (very uncommon symptom for me), slight lower abdomen discomfort and low back discomfort. Is it possible to have a negative test at this point and still be pregnant? Trying not to get my hopes up but body has felt very different over the past week compared to my normal