Could I be pregnant? ?

My concern is that I have 2 missing periods already. .. my last period came on jan 16.. and until this day I have not gotten my period I'm still waiting ... I went and took a clinical pregnancy test and a home one at which both came out negative. ..I'm so confused. ..I was lso taking birth control pills but stopped at one month of taking them.. ? Could this be the reason why my period is not coming