Have just listened to Monday to Friday on iplayer...
Yep, he pushed her back onto the chair, first sign of getting physical again since that night 
Turning Henry against her was heartbreaking.
It did sound like she was saying hurting but fell or collapsed before she even finished the word.
Helens growth scan would be with sonographer and most sonographers are not from a midwifery background so it would just be a scan appointment. I look at my patients notes and ask if they are generally feeling well and get on with the scan. Obviously if the patient disclosed anything to me or if there was anything that concerned me I would take the appropriate action. But as Helen is still covering everything up and trying to act like all is well then the sonographer is not going to think any more of her behaviour than maybe she was just a bit nervous about the scan. Saying that she only really gets in a state when Knob is present so she probably seemed completely fine at the scan.
She must be due to see mw soon, I suspect a little visit to A&E to be checked out will get the mw attention!
Please let this all end soon, H and her baby are at risk. Henry is being emotionally abused. Its all getting too awful.