8 weeks 5 days with hardly any symptoms

Is it normal for me to just have minimal symptoms? I am always a bit tired but I have no nausea AT ALL. I seen the baby and the heartbeat at 6 weeks and 5 days (measuring 6 weeks 4 days) and the heartbeat was 114. Is it normal for me to be this worried? I miscarried in December so naturally that runs through my mind constantly. Thanks for the advice. Someone please ease my mind.