I am 12 weeks pregnant and have been told the gestational sac is measuring 2 weeks behind. the baby is growing as expected and has a strong heartbeat. should i be worried? would a smaller than normal gestational sac cause any complications?

Sometimes ultrasound measurements will reveal a gestational sac that is smaller than expected. It can be difficult to draw conclusions based on a single early ultrasound. A small gestational sac may mean nothing, or it may indicate a higher risk of miscarriage. Getting a series of ultrasound exams as your pregnancy progresses will help your doctor interpret the meaning.