Last period😠😠

Nay • Been try for almost 4 months to get Pregnant👶🍼👣
Was May 2 and here come May 30 and no Af next period due June 27 been cramping for 2 weeks still no period I have a 28 cycle I'm worried some thing is wrong never in my life be Late took a pregnancy test last Sunday it was (-) and I have bad diarrhea and my breast are very Sore what's going on😖