Confused and scared

Brittany

So I'm right a 6 weeks and when I had an ultrasound and only saw a yolk sac and a start of a fetal poll. Had blood drawn and it was 26,302 monday and on Wednesday it was 35,811 so im so confused. My progesterone levels are 11.6 which is good so im scared this will end in miscarriage !!! Anyone had same issue and had a healthy baby!! I have another ultrasound March 1st.