I.X.
I suggest you stop taking pregnancy tests. They are designed to indicate the presence or absence of HCG, not its level. Yes miscarriage is very common. 1/3 of all pregnancies as my last OBGYN just told me. So yes, worry is real for any pregnant woman. But unless you are bleeding and cramping try not to over think it. Its a long wait to that 8 week ultrasound looking for the fetal pole, but try not to drive yourself batty. The fact that your symptoms are strong indicate your HCG is rising. Even so, your HCG can rise and rise and still not have a viable pregnancy. So there is no sense in putting too much stock in symptoms, tests, lines or anything. All you can do is wait. Wish you all the best.