So, good meeting with the midwife today. She got the hospital doctor/specialist on the phone whilst I was there so we could talk through what was going on.
In summary, everyone is a bit shocked that the myoma has appeared from nowhere and is so big suddenly. There is no risk to the baby but I will need further investigation and monitoring.
For now, plan is to have the 20 week scan with the midwife as normal on the 5 July and see how much it has grown. Then I will go to the hospital at around 24 weeks for another scan to see again how much it has grown and ascertain if it is inside my uterus or not. This is key. When we have that clear, which should be at the appointment with the hospital, they will talk me through my options for delivery. If it is outside then I should be able to have home birth still. If it is inside then I will need a hospital birth as I am likely to experience a lot of bleeding that they will have to manage.
There is no mentionable risk of pre-term labour, or changes that can be made in my diet to help. The myoma is fluid filled so baby will shove it out of the way. So whilst baby is fine I am likely to experience quite a bit of pain as baby and myoma get bigger. They were expecting me to already have some discomfort but so far so good.
So, all good until we know otherwise.