I'm sure behavior in pregnant cats differs depending on the cat. From personal experience, I would say yes and no. During the 9 week gestation period, for the first 5 or 6 weeks, my cat meowed a lot less. She became quiet and really affectionate. By the 8th week, as she began nesting and getting restless. She meowed A LOT more often, and continued to be pretty vocal until she went into labor.