She has said she recently changed her contraceptives. They work by foolin' a woman's body into thinkin' its pregnant. Sometimes the effects are good, sometimes not. Some women react in every way like their pregnant except for the baby, breast size increase, retaining water, mood swings, increased appetite, etc, etc. In her case, it appears her body is reacting favorably (from our view point). Pregnancy can do strange things to a woman & its not ever consistent. Some women get extremely horny. Others want nothin' to do w/ sex. Breast size increasing happens more often than not. In some cases a lot. In a few cases a hell of a lot. My wife gained a couple of cup sizes just by takin' the pill. Over two pregnancies she gained a whole bunch of cup sizes & she started out big. Most women will lose most of the breast size gained, but some retain it & even gain some more.
So its no wonder she is lookin' like she preggo.