My period comes like clock work unless i'm pregnant april 18 was my last 1 & it still haven't came home pregnancy test was negative? what should i do?

Tests are accurate: Pregnancy is the most common cause of a missed period. If not pregnant, other causes of a late or missed period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (especially birth control pills), hormonal disorders, etc… a call to one’s Ob-Gyn doctor is a good idea if symptoms are persistent, recurring, or worrisome.