well I have transfered hospitals & this was my first clinic appoint with this midwife. She asked what the date of my last period was (as they all do) But I didn't know, I had an u/s at 6 weeks to find out at the previous hospital and the due date was always calculated from that. But this new midwife told me the proper way to calculated it from if you didn't now when your last period was, was from the 13 weeks scan ( the one that test down syndrome) as it was more accurate. Thus when she entered all my details in the computer it came up with the earlier date! I am 32 weeks now! I just hope baby turns back to the normal position as he was before!