cramps and specs of blood in clear discharge

Ka

So I'm having a lot of dull cramps and my right breast hurts both are bigger than normal. Was suppose to start my period yesterday but it's been clear discharge with tiny drops of blood here and there took a pregnancy test yesterday came out negative. I'm kinda confused when should i test? I'm approach day two of being late. also been crying and super emotional/grumpy... grr HELP!! LOL