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Wondering if you've got a baby on board? Pay close attention to your body. "The hormones released as soon as you conceive may start causing subtle changes even before they're detectable on a home pregnancy test," says Melissa Goist, MD, clinical assistant professor of obstetrics and gynecology at the Ohio State University Medical Center. Unfortunately many, like sore breasts or bloating, also happen right before your period (a sure sign that you're not pregnant), so it's all a guessing game until you take a test. But if you spot a few of the following symptoms -- and your period is MIA -- it may be time to head to the drugstore or your ob-gyn:

Sore Breasts
This is a very common complaint, says Goist. "Breast tissue is extremely hormone-sensitive," she explains. "When progesterone and hCG start flooding the body after the egg is fertilized, they increase your blood volume, which makes your breasts swell and feel heavier than usual."

Cramps
You may feel crampy like you have or are about to get your period, but this discomfort is actually triggered by implantation -- when the fertilized egg attaches to the uterine wall. Your uterus may be stretching a little now (hence the cramps) to prep for its massive expansion over the next nine months.

Spotting
"Many women mistake some light bleeding for a period, but as many as 25 percent will have some spotting during implantation," says Goist. If you notice that your "period" seems way shorter or different from usual, it may be time to take a pregnancy test.

Fatigue
There's tired, and then there's this: If all you can think about at work is taking a nap or if you're too exhausted to keep up with everyday activities like hitting the gym, then it may be your body adjusting to its new mini inhabitant. "Even at this early stage of pregnancy -- within two weeks of conception -- your baby is starting to use up your calories, which can wipe out your energy stores pretty quickly," says Goist.

Nipple Darkening
Are the boobs are looking a little different these days? Pregnancy hormones also affect the activity of melanocytes, or cells in the nipples responsible for their color. "Darker-complexioned women may not notice this until later in pregnancy -- say, around 10 weeks or so," says Goist.

Nausea
While full-blown morning sickness -- which affects up to 85 percent of all preggos -- likely won't strike for a few more weeks, some women may experience more subtle motion sickness early on. "I've had patients tell me they'd suddenly get queasy from reading in the car or would feel sick during flights," says Goist.

Bloating
Can't zip up those skinny jeans? Ramped-up levels of progesterone slow down your digestive track and may make your tummy feel puffier than usual. (This also happens during PMS, notes Goist, but bloating stops when your period arrives, causing progesterone levels to plummet.) If the bloating doesn't go away -- and your period never comes -- start watching for that stick to turn pink.