Clear blue weeks estimator

Hi all, 
I'm 5 weeks 2-4 days and on Friday of last week took clear blue weeks estimator. It said I was 3+! Today, took again (bc I can't get blood taken until 6 weeks) and it's now saying 2-3 weeks. 
Both tests are technically still showing I'm right around where I am, but I'm worried that my levels might be going down. I've had cramping, but no spotting...has anyone else had this happen to them?