Help! Low and slow rising HCG levels


Start of last period was 8-7-19 .. positive at home test on 9-4-19 the day before my missed period.. HCG levels checked 9-5-19 with a level of 37, rechecked again 9-9-19 with a slight increase to 50.. so far symptoms have been strong with breast tenderness, fatigue, and all day nausea.. has anyone had a similar situation with positive results?! Am I over thinking?! Please help me make sense of all this.. so far the nurse has been very short with any questions I have and seems irritated with any responses she does offer.. I dnt know what this all means.