2 days late and 2 negative hpt!! whats goin on?

Ok so i just want some opinions no sarcasm pls, my last period was 14th may, i had sex around 2 weeks after my period,unprotected! I have a 30 day cycle and was due on on the 13th june( today is 15th) iv been gettin cramps but dont feel like am goin to come on,also have a clear\white discharge(sorry) and tender nipples,i did feel sik this mornin aswell.i have done a hpt on yesterday 14th june it was negative, im goin away tomz till sunday so plan on doin another test when im bak if my period hasnt come i just wanted some thoughts on what u all think, thanks in advance oh forgot to add feelin very tired but can not settle at night,took another test today, negative again not even a hint of a line