Pregnancy levels

Patient: Hi! I had an early miscarriage in January of this year. I just recently found out I am pregnant again. I was told to come in for blood work as soon as I found out due to last time. They took my levels on Monday when I was 3 weeks 4 days. My beta hcg level was 190 and my progesterone was at 28. I went back in on Wednesday and found out my levels were now beta/hcg at 459 but my progesterone had dropped to 21.3. The nurse told me not to worry because this number sometimes fluctuates. Just as long as it’s over 12 that’s considered normal. I am worried of another miscarriage. Is there anything I should be worried about? My ob scheduled me to go back in on Tuesday and have it drawn again. Thanks