Hey i am 21 yrs old n i have had sex wid my bf 4 days ago....

the problem is delay in periods have started from last two months. I have had delay of 7 days last month n this time also i have delay in periods n still they have not come. They were suppose to come on 25th april but still didnt came. We did sex without condom so I did pregnancy test also but it was negative.

i am very much worried regarding these period issues.

plz help.