Hi I am 21 years old women. In the month of July, I had light period (First day for normal, second and third day was very light and fourth day it was nothing), while in the month of august I am awaiting for my period on 13th, but It did not happen till now. I am tensed. Checked if pregnant on last week of July but it was negative twice, again checked two days back its negative only. I am not knowing whats wrong? Is this fine. Please help.