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Pregnancy Week by Week: One Week Pregnant. During the first week of your pregnancy, you are not actually pregnant. Conception usually occurs about two weeks after your period begins, which means that your period is counted as the first part of your pregnancy, even though you were not pregnant at the time.
Cramping, which may be felt during the first weeks of pregnancy, have several parameters that must be known: 1  Duration: cramps are usually brief spasms, which last for several seconds, minutes or for a couple of hours maximum; sometimes they may stop for a few days and then appear once more.