U know sandra, there is a thread called PARANOID which has something about not finding a hearbeat at 5 weeks 4 days. Someone else has said that u can see it beating at 6 weeks. U may have caught it at its earliest stage. Mine must of been at six weeks because it was 120bpm. I thought that was low but it does get higher as you go along, hightest for me being 181bpm.

Check out the PARANOID thread in the first trimester general discussion.

Good luck babe