hi im 22 when ever i have sex my periods are late for 10 days or more. ..... which ever month i dont have sex i get my regular cycle. ..... im quite stressed out as my periods are late for 14 days i havnt yet got my regular periods though i did pregnancy test twice ut shows negative. ...... i n my boyfriend never use protection. . but the test shows negative twice n periods yet not come can some one help me out im verry stressed...