Should I be concerned

They have tooken an ultrasound scan from my baby at 24 weeks and everything looked good but because of the baby’s position they hadn’t got the whole view of the heart but still a small part of it and the part the did see looked good and the they booked me another ultrasound at 28 weeks and apparently the baby was already to big to see the right view of the heart that’s what the doctor says and now they haven’t seen the whole heart and talk about how it could be in good health or not and now I’m concerned and I said at least a good sounding heartbeat probably means a healthy heart and the doctor says there could still be something wrong even if the baby has a good sounding heartbeat so now I’m starting to stress over this 🤷‍♀️