HCG LEVELS

Lauren
Hello!! I'm currently 6 weeks pregnant. My first blood test showed my HCG levels at 75 (these were taken last Tuesday), on th Friday I had more taken and they were 218! Monday I had more taken and they were only 321. This has me worried!! Really worried, considering I had a MC at the beginning of the year. I honestly don't think I have the mental capacity to go through that again! My dating ultrasound isn't until the 7th of October :( anyone else have a similar experience and it their pregnancy continue as per normal? This will be baby number 2 for us....