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However, conception doesn't actually occur until around 14 days after your LMP, or later if your cycle is longer than 28 days. Multiple pregnancy: antenatal care for twin and triplet pregnancies CG129. You may know when your LMP was, but not when you actually conceived.
You may have calculated the length of your pregnancy from the first day of your last menstrual period (LMP). It won't hurt, although you may feel a little pressure on your tummy.