period problems

ch

i used to have really irregular periods but i started taking inositol, vitex, vit b6, vit b 12, b multi vit with folate, saw palmetto and chromium then my periods became very regular but now iv started taking NAC since i heard good things about it and stopped takin the saw palmetto and chromium but my period is now 2 dates late and i’m not pregnant what should i do 😥😕