Tilted uterus and early ultrasound.....

Just a sac was seen on my first u/s she also mentioned I have a tilted uterus and it’s hard to pic anything up . But that my sac was empty .

She also mentioned that my hcg levels went from 20143 to 25983 in 2 days and apparently they are not doubling .

Has this happened to anyone and did you have a healthy pregnancy ?!