You are about 3 months, at this stage your baby is just about finding everything she/he needs to survive in the womb. I imagine that the little person, floating around in amniotic fluid most of the time, would probably float upside down a bit too. So this is probably the reason he/she had her head in the wrong place at the particular time the ultrasound was being done. If this is in fact the case.
Did the technician offer any enlighten on this, or did you ask why the baby had his/her head at that particular angle ?
Please ask the proper people these questions, be informed about your pregnancy through your doctor, nurse, obygyn, or whoever you see. Phone your obygyn about this question and get all of the information you need so you wont worry which is definitely not good for you or the baby.
This is one of the most important times in your life.
ms tick