If you have missed your period and the pregnancy test is negative, there are a few things you can do. Firstly, if you have been inconsistent with taking your birth control pills or have missed some, this could affect their effectiveness. It's recommended to take another pregnancy test a few days after the first one if your period still hasn't arrived. If you have gone two weeks without a period, it's a good idea to consult a healthcare professional before continuing with your contraceptive method. It's important to prioritize your health and seek guidance from a doctor in this situation.