Worried! Please help

So I had a miscarriage about 4 years ago, the year after I gave birth to my daughter Zoe, again I am pregnant and going off my last period I am 7 weeks and 2 days but baby measures at 6weeks and 1 day, I've been having cramps on and off no bleeding but they have become very noticeable any opinions on what's going on or what to do? I'm just so worried and stressed out about this.