Yes this is normal. hCG has to start someplace, and she's still extremely early. There's almost never anything seen on ultrasound at 4 weeks, and at 5 weeks you might see a sac. Is she going for more blood work and another ultrasound?
I'm not 100% sure about the fetal pole but at 5 weeks by baby did not have a heart beat then went back at 8 weeks and the little bean was giggling about and had a heart beat