Has this ever happened to anyone..

I’m currently 7wks pregnant. About two weeks ago I got an ultrasound done because I was having a small amount of pain and they saw a gestational sac in my uterus. I went back last week and I saw a baby with a heart beat but when pulled into my appointment following the ultrasound they said they were concerned with the placement of the baby. They said looking at the regular ultrasound everything appears fine but when they look at it in 3D it looks as if the baby has implanted just outside the opening of my fallopian tube// around a bunch of my muscle. They are 100% sure and don’t have any definitive answers I go back for another scan the day after thanks giving but they said if that’s where the baby actually implanted the baby won’t survive and it would be classified as an ectopic pregnancy. I’m so scared and anxious as I’ve never heard of this particular situation before. As of now I have cramping but nothing horrible and I’ve had no bleeding at all. Just trying not to let my anxiety get the best of me back I so badly want this baby.