Hcg levels

Kim • 👼🏻MC 12/5/17👼🏻💖09/2018💖💙11/2019💙💖02/2021💖💙01/2022💙

Okay ladies, I’m worried about this pregnancy. I had a mc on dec 5th at almost 7 weeks. My hcg was supposedly 5k. I didn’t get a period and tested on Jan 10th and it was a clear positive. I went in for an us on Jan 23rd and the doctor said we may be early (around 4 weeks) since he just saw a gestational sac. (But i feel like he was quick during the us. He looked for like less than 20 sec). He told me he wanted me to get a blood draw to see my hcg numbers and then wanted me to go back Thursday. Well i just called and they gave me my beta results back. My hcg on the 23rd was 10,098. On the 25th they were 16,838. To me it didn’t seem like they doubled. And shouldn’t this mean I’m further along? We should’ve seen something more on the us? TIA