It's unclear what started the fight that's being reported in this kind of confusing police blotter item, but the takeaway here is that you should avoid confrontations with pregnant women at all cost. Cops say a 24-year-old pregnant woman was punched in the face by an unidentified assailant in her late 20s riding the No. 4 train at 138th Street/Grand Concourse Sunday night. The pregnant woman then fought back by pulling a folding knife and slashing the woman's left arm. The Post reports that the "attacker fled"... having realized that she couldn't throw this momma from the train. Tip your waitress!