It's common to have mood swings during pregnancy, because of hormonal changes that affect your levels of neurotransmitters (chemical messengers in the brain) and the broad range of feelings you may have about becoming a parent. Everyone responds differently to these changes. Some moms-to-be experience heightened emotions, both good and bad; others feel more depressed or anxious. Most find that moodiness flares up at around 6 to 10 weeks, eases up in the second trimester, and then reappears as their pregnancy winds to a close.
Pregnancy can be a stressful and overwhelming time. You may be overjoyed at the thought of having a baby one day, and then just as quickly begin wondering what you've gotten yourself into. You may be worried about whether you'll be a good mom, whether the baby will be healthy, and how the cost of adding a child to your household will affect your family's future finances. And you may worry about how your relationship with your partner and your other children will be affected — whether you'll still be able to give them the attention they need.