Pregnancy Update

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I went and got blood work the 17th and 19th and my HCG levels doubled. They went from 247 to 550. I went in for an ultrasound today. My OBGYN said I’m 5 weeks and he only sees a sac.

Is that normal? he wants me to get blood work again? I rather wait and be patient if it’s normal. my copayment are high for my insurance and I rather save the money.

Thoughts, opinions and concerns are welcome.