Dont panic, its still early. Most dont even pick it up until at least 10 weeks. The dr couldnt find the hb with a doppler at my 12 week check-up (thats the soonest they even attempt here), it was awful. Booked me an emergency u/s at the hospital and i drove over there bawling my eyes out, called my husband he got out of work and met me there. As soon as the tech put the wand on my tummy, there she was heart pitter-pattering away. The tech said it happens all the time. I cried tears of joy. Turned out she was just moving around a lot. You gotta figure they're still pretty small at that point. If baby is swimming around or tucked up in the back of your uterus or something, there's no way your gonna hear it.