Ovulation occurs; ideally, sperm will already be lying (er, swimming) in wait.
Though some women swear that they were aware of the moment of conception, most are oblivious. The radical hormonal changes of the first trimester don't kick in until implantation, which happens between three to five days after conception. If you've been trying to get pregnant, you may be waiting on the edge of your seat until a test can confirm your pregnancy. If you weren't trying, you may be on the edge of your seat for the same reason.
If you take a pregnancy test on the first day you miss your period, there’s a 10 percent chance that you’ll get a false negative reading, according to a report in the Journal of the American Medical Association. If you mistakenly believe that you are not pregnant, you might not avoid potentially harmful substances. In the interest of safety, assume you are pregnant and retest a week later. Learn more about the first trimester
Things to think about this week
Your breasts may be extra tender as early as a week or two after conception. “You’re making so much estrogen and progesterone in early pregnancy that the glands in the breasts start growing,” explains Jasbir Singh, M.D., an OB-GYN at Baylor Medical Center at Waxahachie in Texas. This hormone surge causes breasts to retain more fluids and feel heavy, sore or more sensitive than normal PMS tenderness. How your breasts change during pregnancy
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