What should my hcg levels be?

Wednesday night I found out I am pregnant they did an ultrasound it showed my uterus was empty and they seen a spot by my right ovary which they think is the baby 😭 so I was admitted to the hospital on Wednesday night my hcg levels was 710 then 6 hours later they recheck them and my levels was 741 then 28 hours later they recheck them and they was 1177.0 they also did another ultrasound and still didn’t see a sac or anything. They want me to come back on Monday for a recheck of my hcg levels. He said they should double by Monday so what should my levels be if they double?