Hcg levels in pregnancy

About 4 days ago I had a little spotting. Went to the er the next day just to make sure everything is ok. My Dr took many blood test my hormones being at 148.2 he wanted to check those hcg levels again a few days later to see if it doubled. Well as of yesterday they went up to 236.5 but he still isn’t happy. So my question is has anyone had this and the pregnancy be fine? Or had this and what were levels if it was a miscarriage?