I was suppose to start my period on the 6th of this month, it is now the 18th of July and I still have not started my period. I took a pregnancy test and we thought we saw a second faint line but I went to the doctor and did another test and they said it was negative. Is there any other reason why my period is so late? It’s been late before but only like 3-5 days late never 13 days late.