Raised Ca 125

Good afternoon all.

I was wondering if anyone could offer any advice. I had my CA 125 taken around 6 month ago which came back slightly raised at 138, had an USS which was clear. The doctor said the Level of CA 125 could just be normal for me. Every 2 month now I have been having the CA 125 rechecked with each time being more raised than the last (38, 43, 45, 56). Does anyone think I have anything to be concerned about or has anyone been in a similar situation? 

Thanks Nicola