i have had 2 scans already one for dates and one for check up as i had bleeding and i have had previous m/c's. my ob checks with u/s each visit to make sure bubs is growing and no problems have arised. scans are useful i had a placenta covering some of my old c section scar at 20 weeks and having a repeat c section it can be dangerous, so i was monitored by my ob to make sure it moved. its good to know certain things as they can be life threatening and will be doing the same things with this pregnancy to ensure my baby is healthy and stays safe until he or she is ready to meet us.