If your period is regular and lasts 28 days, and if ovulation generally happens on day 14 of your cycle, then conception probably took place about two weeks after the LMP. For gestational age counting, these two weeks are added to a pregnancy as a simpler method than trying to track from ovulation or fertilization.

Do doctors add two weeks to ultrasound?

Ultrasounds in Later Pregnancy Between 18 and 28 weeks of gestation, the margin of error increases to plus or minus two weeks. After 28 weeks, the ultrasound may be off by three weeks or more in predicting a due date.

Can your stomach grow when your 2 weeks pregnant?

2 weeks pregnant belly Inside your belly, your uterine lining is thickening up to make sure its ready for a fertilized egg. If you do conceive by the end of week 2, your body will start making some changes - like slowing down your digestion - that could cause some abdominal bloating.