My last period was July 22 and I am due again on August 20th. On August 10th I had unprotected sex twice back to back using the pull out method. Two days later I started cramping with stretchy clear discharge... what are my chances of becoming pregnant

Let's say you could actually calculate your chances (you can't) - what good would it do?
Say the chances that you are pregnant are 31% (I just made that up).
That means that out of 100 women who have sex under your conditions, 31 of you will get pregnant and 69 won't. You will be in one group or the other. Which ever group you are in, you are either 100% pregnant, or 100% not pregnant.
That's ALL that odds, chances, probability means.
Even if the odds were a mere 1%, what if you were that one woman out of 100? You'd still be 100% pregnant.

The pullout method isn't a method at all - it has a dismal failure rate as birth control. Men leak sperm, even when they don't think they do, and even when you don't see or feel any.

You are fertile mid-month, but that can vary a lot from month to month. And you may suddenly find that your 'regular' number of days has an odd month, or even changes for months or years or the rest of your menstrual life.

Stringy liquid is often a sign of ovulation. So is cramping. That doesn't mean you aren't pregnant. If I were forced to give odds, I would say you probably aren't. But don't quote me.