Tubular pregnancies

In August of last year we lost a baby due to it being ectopic and for my health.  Before we found out the issue I had lots of spotting and cramping. It was discovered at 6 weeks and I was able to keep my tube as it hadn't ruptured yet.     We just found out we are expecting again. This time there's no spotting and no cramping however my dr is concerned my hcg levels are rising "correctly".    Has anyone else been through this and can offer up any advice?