can someone tell me?

I missed 5 days and I did took a pregnancy test and came negative. usually when my period is coming , the right side of my boobs really hurt me but this time, both of my breast is bothering me just a little bit. I don't see any sign of pregnancy base on my research but I never really missed a period all my life but on the other hand I don't have any sign of pregnancy aside from slightly pain in my boobs. Anyone who have the same experience?