Ive used meth a couple times. and should i b worried that i havent started my monthly. im 3 days late?

Never touch meth: In a woman with regular periods, some causes of a late period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (like birth control pills), hormonal imbalances, etc… Seeing a doctor is a good idea if symptoms are persistent, recurring, or worrisome. Pregnancy is the common cause of a missed period, if sexually active.

Cycle can be effecte: Your cycle can be effected by many things including pregnancy and meth is one. You need to stop it or you will end up where you don't want to.