Saw brown stain spotting 6 days before period is that sign pregnency

No: This is old menstrual blood mixed with vaginal and cervical mucous.

No necessarily: Spotting before your periods is not necessarily a sign of pregnancy. I would take a pregnancy test around the time your period should start.

No necessarily: While it could be, it is more suggestive of an infection or even possibly a luteal phase deficiency. If you miss your period do a pregnancy test to know more.