I watch the show everyday on my lunch. I have only missed two shows this whole seasons. As we all know there is much that we do not see that goes on in the house but I am the kind of person who pays attention to who is drinking and who is not. I have not seen Christina drink once this season. Unless of course she was slipping alcohol into her punch cup.
It is very much a possibilty that she could be pregnant and not know who the father is with the lifestyle that she led. She also may not have wanted to discuss this until now so that no one would try to talk her out of having her baby. I really do not believe someone can go this long before they realize it is a possible they are pregnant. But everyone is different and a lesson I am learning in my life is I am not one to judge because I have my own problems, and I do not know everything.