Symptoms gone?

My nausea has significantly subsided over the last few days and my boobs haven't been sore for a while, either. I'm still tired and hungry all the time and peeing often (can't be sure whether it's cause I'm drinking lots of water or not). I know I should be relieved I can feel a little better (my morning sickness is generally all day) but I'm just worried something is wrong. I'm 7 weeks on the dot today, and my first scan will be next Thursday at 8 weeks 2 days.