Still haven't gotten my period.

I was supposed to get my period 11th to the 15th. Then the 15th to the 18. 

 I posted about a week or so ago. I took two test and both came out negative. But my boobies/nips are sensitive. But not hurting to the touch. Still no period. Today's the 25th and I still didn't get it. I'm not really stressed anymore. I don't know what to do next. If we are pregnant hell yeah! We will be happy and ever and if not we'll were not. But I was told to not have sex for a week to see if I get my period or not. If I don't take another test and if it comes out negative get blood test. What should I do.