What is happening with my SO (female)

My partner has turned into an emotional wreck... sometimes its about dogs, cats... cute things and other times its when I come home from work after 3/4 hours...

And she is CONSTANTLY complaining about her boobs... she has even taken to mesuring them or asking me... 'do my boobs look big to you?' My reply is usually 'yes dear of course dear... damn.., they are.' But why is she complaining so much -_- is she PMSing or is she Pregnant? We had 'BD' through most of her FW and her 'AF' isnt due for 10 days...