The first trimester brings with it a lot of change. As your body adapts to pregnancy, and your hormones go into overdrive, you may notice a number of possible symptoms. All women, and all pregnancies, are unique, and some women do not report many symptoms. Other women, however, find themselves experiencing a number of the following 10 common first trimester symptoms:

1. Missed periods

This is probably one of the better known pregnancy symptoms. For many women, a missed period may be the first clue of pregnancy. Most women find that their periods stop during pregnancy, and for some, these will not return until months after the birth. A small number of women experience regular vaginal bleeding during pregnancy, though this is not really a menstrual period. Any vaginal bleeding during pregnancy should be discussed with your healthcare provider.

2. Morning sickness

Though the name cruelly suggests otherwise, morning sickness can occur at any time of the day. Nausea and vomiting is caused by rapidly increasing hormones during the first trimester. This symptom starts around week six of pregnancy, and usually eases off by the end of the first trimester.

3. Fatigue

Your body is working hard during the first trimester, and you may find yourself exhausted before the end of the day. There’s not much you can do to fight it, so your best bet is to get as much rest as possible.

4. Food aversions and cravings

Cravings is another infamous pregnancy symptom, with some women eating bizarre food choices as they battle with nausea, sickness and hormonal changes. You may also find yourself experiencing food aversions. Indulge the odd craving, but do try to eat a healthy, balanced diet throughout your pregnancy.

5. Breast changes

Your tender breasts may have been one of the first giveaways that you were expecting, and over the first trimester you will notice a number of changes to your breasts. You may find that your breasts are sore, tender and, as a result, out of bounds to your partner. By the end of the first trimester, you may find that you need to buy new bras to accommodate your growing breasts. Your nipples may darken and become larger, and you may notice the appearance of small bumps on your areola.

6. Mood swings

It’s never nice to be accused of having mood swings, especially when you are. The hormonal roller coaster of the first trimester can leave you feeling a little emotional. On top of this, you may be feeling worried about your pregnancy and impending motherhood. If you find yourself reacting irrationally to situations, chalk it down to a symptom of early pregnancy.

7. Frequent urination

Many people assume that the frequent urination during pregnancy occurs during the final trimester, when a baby is pressing down on your bladder, but it can start as early as week six. It should ease off slightly towards the end of the first trimester, as your uterus shifts position, putting less pressure on your bladder. This symptom will be back with a vengeance during the final months of pregnancy though.

8. Increased vaginal discharge

You may notice an increase in vaginal discharge during the first trimester. Your body produces mucus to prevent infections from traveling to your uterus. The discharge should be milky, clear and odorless or mild smelling.

9. Increased sex drive

When you’re not throwing up or emptying your bladder, you may find yourself feeling more aroused than usual. Increased blood volume during pregnancy means there is now more blood flowing to your genitals. This can cause increased sensitivity, and leave you with an increased sex drive.

10. Shortness of breath

Progesterone, one of those pesky pregnancy hormones, increases your lung capacity, allowing you to breathe deeper during pregnancy. It may take you a while to get used to this change, leaving you feeling short of breath in the first trimester. You need around 20 percent more oxygen during pregnancy.

References:
1. http://www.whattoexpect.com/pregnancy/your-body/week-6/bathroom.aspx
2. http://www.nhs.uk/conditions/pregnancy-and-baby/pages/vaginal-discharge-pregnant.aspx
3. http://www.patient.co.uk/doctor/physiological-changes-in-pregnancy
4. http://www.babycentre.co.uk/a253/mood-swings-in-pregnancy
5. http://www.thealphaparent.com/2012/08/timeline-of-breast-changes-in-pregnancy.html