8weeks and heartbeat not detected

Annemarie
Booked a reassurance scan for today with peek a baby due to previous miscarriages. Shocked to find that their isn't just one baby but two. Totally blessed! I'm just really really worried now tho as they couldn't pick up a heartbeat with either of them and said there is some internal bleeding. With my calculations from last period I would be 8weeks and 2 days - today and babies are measuring dead on 8weeks which I believe could b a good sign to show they are growing. Im still getting pregnancy symptoms.. sickness, tender breasts, tiredness, lack of energy, cravings and going off certain foods. Iv had no bleeding or cramping what so ever. Just wondered if anything as ever had this and things have turned out ok.. im so so worried.