NT scan is important and will done by the doctor, please consult with your gynecologist and tell her to understand your mom in law, gynecologist wil guide herbest at this time. I can understand her problem but all the test or ultrasound pregnancy are necessary during pregnancy as it wil helps to know baby's development. No one can tell you without viewing your reports that everything is okay please meet your gynecologist soon and before going to her take an appointment so that you will get check up on time and always carry sanitizer with you whenever you go out.