Period is due today an now have light spotting with clear stringy discharge do i still have a chance at being pregnant or this is my af help?

Pregnancy possible: If you're period does not come in the next couple days, use a home pregnancy test. Discharge can have many causes, and if bothersome you should see your gynecologist.

Not sure: You need to have missed your period. I recommend checking a pregnancy test when 3-5 days late for a period or if the period is very light - such as scant spotting.