Thank you both so much for your speedy replies and congrats, and for such reassurance, much needed and appreciated!
Ali - that's really interesting - my H and I were wondering if the IVF had somehow made me a bit more fertile! Also about the progesterone - I had been googling to see if there was any harm but your theory about a sudden drop makes scary sense. I will stay away.
Roxbury - Congratulations!! Fab news - I had no idea how common it was. Wonderful also about your friend at 16 weeks and that her body has taken care of things without any help. Are you planning on having an early scan? I think the NHS will scan me due to my ectopic last year (that is my other anxiety - that this one is in the right place), but if for any reason they don't, I think we will book a private one.
Looking at your signature, I can see you have been through the mill a bit, wishing you much luck and thanks again for the reassurance x