8 weeks pregnant !! helppp!!

I'm 8 weeks pregnant and I was having mild cramping with no bleeding . So I went to the er they did an u/s and the transvaginal u/s. they told me everything looks good but they don't see or hear the baby heart beat I might have an ectopic pregnancy. But mind you a week before I did an u/s my baby hear heat was 126bpm. Any suggestion ?