Your friends aren't pregnant, just retarded.
From the people who brought you "I like it on the kitchen counter" and "10 inches :(" comes the new & slightly more panic-inducing:
The template is I'm _ weeks and craving _. The weeks correspond to the month of your birth (Jan = 1 week, Feb = 2 weeks, etc) and the thing being craved matches the day (born on the first and you crave Skittles).
Apparently, this is to raise awareness for something. Probably breast cancer