My contraceptive is over and menstruation has not come ...

My contraceptive ended on 01/05, until today, 05/14, my period did not come and did not even give a signal. I have not forgotten to take any pills and my menstruation is super regular. I did the BHCG on Saturday and it turned negative. Is it possible to be pregnant even if the test was negative? What else can cause the menstrual delay?
Expert answer:

You should not be pregnant. Many things delay menstruation, but most of the time there is no reason, it just does not come. Restore your contraceptive and forget your period that did not come ... You should see your doctor if it starts to be common.