To drift just a bit . . . .

One day I was seated on the bus when a youngish gal of about 25-ish stood near where I was seated. Her face was a bit damp and red. She was breathing louder than yer average person. I asked if she was OK. She said yes, but then said, "Would you give a pregnant girl your seat?" I stood immediately and she sat down. However, I then noticed no sign (protruding belly) one generally associates with that condition. So, I said, "Pardon me for being so forward, but how long have you been pregnant?" She replied, "About 15 minutes, and man, am I tired."