I had an ultrasound yesterday I was 18 weeks and six days. The doctor said the femur and heumors was measuring short, but the head, heart, liver, kidneys everything was fine. He has me worried six about down syndrom. he didn't recommend going to get tests done or seeing anyone else. just to come back in three weeks to check on the growth. Should i be worried about the baby having DS or will all be ok, my husband and i are very short, and i am on zolft and blood pressure meds and they said this could happen the baby being small,