Scarce Symptoms

I'm about 5 weeks pregnant. Just found out today. Took two tests, and they were both positive. I lost my first baby at 12 weeks, and am scared to death to lose this one (this is my second pregnancy). My first baby my symptoms were almost immediate after implantation. This time around I didn't even know I was pregnant until I was 2 weeks late and thought maybe I should test... Does this mean I will probably lose this one soon? Because my HGC levels appear to be lower in accordance with my symptoms? Or does your body adjust a little bit, and so that might be why they symptoms aren't as prevalent? I am so terrified to miscarry again.