Pull-out is not really a birth control method. It is jaust a technique to lessen the risk.
Right now is a good time to take a test. Follow the instructions and use the second stick a week later to confirm the results if the first one is negative.
There are various reasons your period can be delayed or absent. Stress and worry is a big factor.
PLEASE take better care of your health and future. Pull-out is not the answer. You have to protect yourself from STDs (especially if he was not a virgin) and pregnancy.