When you’re having a baby, your body will go through a multitude of changes. Some you’ll expect (the weight gain, for example) while others might come as a surprise (hello, hemorrhoids!). Here’s the rundown on the trimester-by-trimester changes most expectant moms experience. Keep in mind that while these symptoms are perfectly normal, if any cause you severe discomfort or stop you from going about your daily routines, talk to your doctor.

In Your First Trimester
 In the initial trimester, your body isn’t quite used to the idea of being pregnant yet, and your increasing hormone levels are wreaking some havoc. Here’s what to expect:

• Your breasts will most likely become swollen, and your nipples may start to stick out.

• Morning sickness can cause some soon-to-be new moms to have upset stomachs or to throw up.

• An increase in hormone levels can bring on acne (talk to your doctor before using any acne medication).

• Mood swings may occur (again, blame the hormones!). Don’t be surprised if one second you’re laughing with friends and the next you’re sobbing.

• It’s likely you’ll experience constipation or difficulty with bowel movements.

• You may need to urinate more frequently.

In Your Second Trimester
By now your body has probably settled into a more steady pregnancy routine. Here’s what expectant moms should be on the lookout for during this time.

• General body aches in the back, groin, or thighs may start to kick in.

• Your skin may start to change, including a darkening around your nipples and the appearance of stretch marks, especially on your stomach, breasts, thighs, and buttocks.

• Your ankles, fingers, and face may start to swell.

• Other normal symptoms are itching of the abdomen, palms, and feet as well swelling of your ankles, fingers, and face. However, if any of these symptoms are accompanied with nausea, a loss of appetite, vomiting, or extreme fatigue, contact your doctor immediately, as it could be a sign of something more serious.

In Your Third Trimester
Good news: You’re almost at the finish line! Here are a few additional symptoms expectant moms may notice in those final weeks:

• Shortness of breath, heartburn, and swelling may occur, as well as the development of hemorrhoids.

• Your breasts may become very tender, and may begin to leak colostrum, a watery pre-milk your body produces as it gets ready to provide nourishment for your new baby.

• Your new baby will probably “drop” during these weeks, moving lower in your abdomen to prepare for birth.

While some of the symptoms are annoying and even worrisome, keep in mind that most disappear within a few months of giving birth. And by that time, you’ll be so in love with your new baby, you won't even notice a little acne!

Many first-time expectant moms are understandably nervous about the labor and delivery process. A smart way to alleviate any anxiety associated with the birth of your new baby is to learn as much as possible about what to expect, including the difference between true labor signs and false alarms. Pocket this advice and you’ll be ready to take on your labor with confidence.

Beware of false alarms. Many soon-to-be new moms experience false labor pains known as Braxton Hicks contractions.  If you're not sure whether these might be real labor pains, remember that false contractions are irregular in their timing. And if changing your activity or position makes the pain go away, it's probably false labor. On the other hand, true labor contractions take place at regular intervals and occur more frequently as time goes on. They’ll last anywhere from 30 seconds in the beginning to 90 seconds as labor progresses, and walking or any increased activity may cause the contractions to intensify.

Look for other signs. While labor pains are usually a sign that you’re nearing your delivery time, there are other indications that labor is not far away. For starters, the new baby may have dropped, also known as lightening. This simply means your little one has settled into your pelvis. In some instances, a woman's water may break before labor begins, which occurs either as a sudden gush of fluid or a steady trickle. This is the amniotic sac, which is a fluid-filled membrane that protects the baby in the uterus. Once this occurs, there is an increased risk for infection, so if labor has not already started, you may need to be induced.   

Call the doctor You'll want to call your health care provider (and prepare to head to the hospital) if your contractions are growing stronger and occurring at shorter intervals. The same is true if your water has broken. Likewise, severe vaginal bleeding or cramping, as well as pain in your belly, back, or pelvis, are reasons for an expectant mom to call for emergency assistance.

When it comes to childbirth, the more prepared you are, the better, so memorize the signs of labor -- especially if this is your first delivery. Simply understanding the changes that take place in your body when the time finally arrives helps to put you at ease and prepare you for the birth of your new baby.