If you have not overstayed your fiancee visa, write to the authorities TODAY (that means NOW, send recorded). Explain IN DETAIL to them why you cannot get married within the 6 months, and the EXACT date you will be getting married.

Rarely do they extend, but they did with me due to medical reasons, if you have a letter from the GP stating pregnancy complications, or something, they will probably extend, but no more than a month or two.

If you have no reason other than can't be , she has to go home......and they will want to know why you lied to them in the first place to get a 6 month visa. Easiest thing then is to marry in the Phil.

Why do people complicate such simple things?