Thanks ladies.
I had an IUI so we know when I Oed. We were wondering if it was late implantation because I got my bfp on cd14 which is later than my other bfps. I have a history of mc so that's why he is not too confidant. The first one never got a heartbeat, then I had twins and one didn't get one and one got a flicker. So he said this is low and it worries him.
I had a scan a week ago and they didn't even see the baby, they said it was too early.