My sister is pregnant out of wedlock.

So, my sister, who is 26 (soon to be 27) is pregnant. Our parents are extremely religious and very judgmental (even though they say their not). I was judged harshly because I was living with and sleeping with my husband before we got married. This would be my parents 3rd grandchild (my oldest sister has 2 but is married). Well, she's has NO idea how to tell my parents. She wants to tell them because they'll be more hurt that she didn't. But, she kinda wants to wait after her first ultrasound because they don't know if she's 5 or 9 weeks along because she's been irregular the past couple months. But, if anyone out there has gone through this, help me out please because my sister is my BEST friend in the world! And there's no way I'm telling my parents because I wanna stay out of that and it's not my place to tell them.
My sister is pregnant out of wedlock.
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