Pregnancy

5. Tender, swollen breasts

One of the early signs of pregnancy is sensitive, sore breasts caused by rising levels of hormones. The soreness and swelling may feel like an exaggerated version of how your breasts feel before your period. Your discomfort should diminish significantly after the first trimester, as your body adjusts to the hormonal changes.

4. Nausea

For some women, morning sickness doesn't hit until about a month after conception, though for others it may start a week or two earlier. And not just in the morning, either: Pregnancy-related nausea (with or without vomiting) can be a problem morning, noon, or night.

About half of pregnant women with nausea feel complete relief by the beginning of the second trimester. For most others it takes another month or so for the queasiness to ease up. A lucky few escape it altogether.

3. A missed period

If you're usually pretty regular and your period doesn't arrive on time, you may decide to do a pregnancy test before you notice any of the above symptoms. But if you're not regular or you're not keeping track of your cycle, nausea and breast tenderness and extra trips to the bathroom may signal pregnancy before you realize you didn't get your period.

2. Your basal body temperature stays high

If you've been charting your basal body temperature and you see that your temperature has stayed elevated for 18 days in a row, you're probably pregnant.

And finally ...

1. The proof: A positive home pregnancy test

In spite of what you might read on the box, many home pregnancy tests are not sensitive enough to reliably detect pregnancy until about a week after a missed period. So if you decide to take a test earlier than that and get a negative result, try again in a few days. Remember that a baby starts to develop before you can tell you're pregnant, so take care of your health while you're waiting to find out.