I'm pregnant!!

Kirsty
Ok so found out 2 months ago I'm pregnant I am 10 weeks today and really confused as can't hear baby heart beat on fatal dopper but I can here my placenta? Does that mean that my rainbow 🌈 baby is ok? .. I have my 3 month scan the 9th off June and I have never been so scared as the last two pregnancys I had a silent misscaraige:( ... and can't help thinking the worst please help  My boobs are still saw and when I get up sometimes I feel light headed never had morning sickness suppose that's a good thing?