I'm so sorry you are in so much pain. Are you seeing a chiropractor or a physiotherapist? They may be able to help relieve some of the pain, although sadly I cannot promise it will go away altogether. I am 5'5" and my husband is 6'6". We were also told to expect a very large baby but I have not had one over 8lb3oz. I would take any size estimation with a pinch of salt as they are notoriously unreliable in your 3rd trimester.m I did suffer terribly with SPD, but found it did not affect me in labour as I was able to open my legs wide enough to give birth on all fours without putting strain on my pelvis.

Most women with SPD can go full term and deliver vaginally, but like anything you need to consider your own personal situation and not the average woman's. In your situation I would be seeing a chiropractor, and ensuring my midwife was fully aware of how bad things were. Your midwife and chiropractor will be the best people to help you decide if you can go full term and give birth vaginally.

In the meantime have you mentioned the lesser movements to your midwife? If not then this is something you need to have checked asap just to make sure bub is still happy in there.