2 weeks ago may have been too soon for you to test for your body. The best advice has been given in my opinion. You need to have a quantitative blood test done (BETA). it is the best way to test for pregnancy. There are other reasons why someone would not have a period also. Other medical conditions and stress no matter how little can alter a period.
go to the doctor ask for a quantitative blood test. it tells the levels of hcg instead of a qualitative blood test which just says yes or no. hope this helps.
I know someone who went to get birth control and they confirmed her not pregnant... She continued her pills and started having bad pains in her lower stomach... She discovered she was 3 months pregnant. She got negative tests for 3 weeks.
So I would get a blood test done. That's the best way to find out for sure.
you should take another test... thats the only way to know....
Good Luck