Gosh a confusing time of uncertainty for you! I know my cousin continued to have af the whole time she was pregnant with her girl and only found out at 25 weeks!
I however have had an ectopic so I guess it is a possibility as I was in hospital for weeks just cause the doctors were not sure and then once they were they gave me a shot and sent me on my way... Unfortunately the shot failed and my left tube ruptured and I was pretty lucky I got to hospital to sort it in time.
Looking at the dates you might already know what's happening?