Low hcg??

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Hi everyone, I recently had a miscarriage in July. I have gotten pregnant again, my doctor confirmed it Tuesday. I went in on Tuesday for a quantitative hcg blood test and when I went in today she told me my hcg was at 49. She said I’m probably just really early and we did another blood test today. I am cramping no bleeding just cramping but i had this cramping with my first baby a few weeks before I lost it... I don’t even know how far along I technically am since I conceived right after my miscarriage... is 49 a low hcg level?? I feel like my levels aren’t doubling every 2 days like they should because I started getting positives on 25/miU tests like 3-4 days ago... 😓