is it normal for symptoms to come and go?

So I'm exactly 6 weeks pregnant today and I've noticed a slight drop in some of my symptoms, from the day I found out I've felt pretty strong nausea all day every day and now it's lessened almost to the point I don't feel any nausea, my boobs are still painful but no where near as bad as they were. i was having cramping to start with but thats all gone now. Though I am still super tired, where I live we don't have a first scan till 12 weeks so I'm just trying to reassure myself really.