PREGNANT PAUSES

You've come a long way to make a baby: 1952 CBS won't let I Love Lucy use the word pregnant while the Ricardos are expecting. 1967 The Rolling Stones can't sing ''Let's Spend the Night Together'' on The Ed Sullivan Show unless they change the lyrics. 1972 The single Mary Richards admits taking the Pill on The Mary Tyler Moore Show. 1975 All in the Family's Gloria tells Edith and Archie she's pregnant. Archie says, ''Don't say that word. It sounds like you did something dirty.'' Son-in- law Mike answers, ''We did.'' 1991 18-year-old Doogie Howser, M.D., will lose his virginity on the season opener this month.