We found a huge spider with a white sack attached to it. When we killed it, goo squished out. Do you know what kind of spider this is and is it poisonous? Also, was the spider going to have babies? Is that what the white thing was?

Since I don't know what the spider looked like, it is impossible for me to tell you what kind of spider it was. However, the white sac was indeed the egg sack. The spider hadn't had a chance to lay her eggs when you killed it. I wouldn't worry about it being poisonous if no one was bitten. If you have a picture of the spider, post it and I will attempt to identify it for you.