Joe, you didn't tell us how old you are, or exactly how you feel about this woman. Does she want to have the child? Would you consider marrying her?
Would she want to marry you?. We also have no idea about your financial situation. I really can't give an opinion about how I might react in such a circumstance without having more information.

You should try thinking about how she may be feeling. How old is she? Is this her first pregnancy? How does she feel about being pregnant?