Since you had a transfer done, you know the exact dates related to your pregnancy. This could be why your doctor is not as optimistic. If you had gotten pregnant through just intercourse, then the doctor would probably just assume that your dates are off. The best thing you can do is not worry and just hope that the baby's heartbeat will appear soon. I wish you the best of luck.
bless ya, i know that a baby heartbeats at around 6 wks, so im sure there is a chance that it can still work out well, maybe your lil one implanted a lil late and is slightly behind in growth?
Thank god for science else most of us would have never seen a BFP BUT...... science can never outdo nature and does not know everything, still have faith that lil one will be ok, I wish you all the luck in the world and pray for a positive outcome for you, x