6w3d ultrasound

Rakai
Had an ultrasound yesterday. Doctor said everything looked on track so far. There was no heart beat yet said it was too early. I've seen where people have gotten a heart beat that early should I be concerned? Also they said my uterus is tilted so idk if that had anything to do with it. I go back in 2wks for another. This is my second pregnancy after a miscarriage in January.