Early pregnancy symptoms affect all major body systems producing a range of physical symptoms from pelvic pain, missed periods, nausea, vomiting, and heartburn to abdominal achiness, hemorrhoids, and shortness of breath. 

However, it's wise to keep in mind that not all pregnant women have the same symptoms. Some women have very little signs of pregnancy. For example, nausea and vomiting are among the first pregnancy signs, yet only 1 in 3 pregnant women have some nausea and many women do not have any nausea even though the pregnancy is progressing quite normally.

According to most data, more than half of all pregnant women suffer from nausea and vomiting during their pregnancy. Since each woman is different, the severity of nausea and vomiting in pregnancy will vary from woman to woman. You could be pregnant, although being nauseous does not necessarily mean that you are pregnant.

Some pregnancy symptoms carry more weight in helping detect a pregnancy than others. While tiredness and nausea can occur early on, they can also signal other conditions besides pregnancy.  It's even possible that symptoms can change with each new pregnancy you have.

Of course, the most reliable way to diagnose a  pregnancy is to do a pregnancy test. The pregnancy test is usually positive when you miss your period, though sometimes it becomes positive many days later. Over 50% of pregnant women will have a positive pregnancy test within 1-2 days of missing their period. Over 90% of pregnant women will have a positive pregnancy test within 1 week after missing their period. A repeatedly negative pregnancy test more than a week after missing your period usually means that you are not pregnant.

Are you feeling a little queasy? Wondering why your breasts are so tender? What about those crazy mood swings? Could you be pregnant? Take this quiz created by Dr. Amos Grunebaum and see how your answers add up!