HCG levels in pregnancy

Hi. Wondering how many mamas had concerning HCG levels in first few weeks of pregnancy? I went in for an ultrasound and they could not see a sac or baby yet so they assumed I was really early. I did have thick uterine lining but that is all that showed on top of a few positive pregnancy tests. My HCG levels rose from the friday I went in to monday when I did my second round of blood work but the levels did not double. They only went up about another 1000. I’m going in to do more bloodwork tomorrow and then an ultrasound on thursday but I’m pretty concerned. My question is has anyone been thru this and still had a healthy pregnancy and it not been ectopic or nonviable?