Symptoms at 6 weeks

Mary
This may sound ridiculous but I'm supposed to be 6 weeks but I don't have any symptoms really, I'm a little tired, but that's it. No nausea, no sore breasts, no aversions or cravings for food... Is it possible to have a miscarriage and not know? I haven't had any cramping or blood... I am probably jinxing myself and I will regret asking, hut I just feel totally fine other an being tired.