Lisa, I hope evrything is ok! The same thing happened to me. I got a blood test early on because I had a bad chest infection and needed antibiotics and chest x-ray. Anyway bloods came back negative so took abs and had x-ray. A week later I amost passed out in shops, so I took home preg test it was positive! Went back to Dr, had more bloods. Then I started bleeding. Went back to Dr who sent me for urgent u/s. They couldn't see anything on u/s so said I had a m/c. Was really depressed so we went away for a week camping. Then when I came back had more bloods to make sure I had a complete mc and that hcg was dropping. Well hcg was through the roof so now they said I had an ectopic preg and had to have another urgent u/s. Was the best moment when during the u/s the sonographer showed me my baby's heartbeat!! I cried for days!! Apparently I must have ovulated late so was very early preg for first u/s. Anyway I did bleed some more but my gorgeous bubba is now a healthy 4mth old!

I hope it all works out for you and your bubba has just been hiding!!! Fingers crossed!