unknown miscarriage

Kinga

so i fount out im pregnant i think i fell in july 24 but doctors are telling me different so ive had bleeding since 6 days now can i just say not bad at all just period like but less i went hospital they told me its fine then i went again and they told me come back when you get worse and they booked me for a scan monday 10 september (today) so i went in not thinking much of it and they did an ultrasound on my belly and they couldnt see any thing because my bladder was empity so they did an internal ultra sound and my baby was right there i could see a beautiful little head and little body i just cried my eyes out when they told me theres no heart beat they said the heart stopped at 7and a half weeks by my notes thats today im going to be 8 weeks tommorow but they said to me i must of fell pregnant in early june they said because by our couculating you are 6 weeks pregnant but if i fell pregnant in july 24 i swear that makes me 7 and 5 days pregnant am i right or wrong are they the truth or not im having another scan friday only because i requested it and they said yes im really scared is my baby to small to hear the heart beat what do i do is my baby really there but the heart beats gone ???😭😭😭😭😭😭😭😭💔💔💔