Psychology Developmental Psychology These Moms Tell You What to Expect in Your First Trimester Share Pin Email More in Psychology Developmental Psychology Piaget's Stages of Development Parenting Theories of Development Basics Personality Development Cognitive Psychology Behavioral Theories Psychosocial Theories History Personality Psychology Leadership Psychotherapy Neuroscience and Biological Psychology Branches Social Psychology For Students Glossary View All Updated May 27, 2016 So, here's the thing. Your first trimester is—as one mom states—no joke. The good news? It doesn't last forever. These moms talk candidly about their first trimesters, leaving no details behind.