help :/

im 6 days late and still no sign of period except some light cramps at night and in the morning, my breasts have been sore for almost 2 weeks which is normal i always get that before my periods.. i took a test but it came negative i dont want to be pregnant and ive never had unprotected sex (i always check the condom thoroughly during and after use its never broken or anything) i have been stressed bc im late but ive been stressed before and still gotten my periods i dont feel like im going to get it like i usually do.. is 6 days late normal ? have any of you been this late before? 😥😥😥😥