A woman at 40 weeks gestation calls the labor unit to see whether or not she should go to the hospital to be evaluated. Which of the following statements by the woman indicates that she is probably in labor and should proceed to the hospital?

The contractions are 5 to 20 minutes apart.

The contractions are regular, about a minute long and I am unable to talk through them.

I saw a pink discharge on the toilet tissue when I went to the bathroom.

I have had cramping for the past 4 hours.