Spotting on and off in early pregnancy

I’ve been spotting on and off and I’m terrified of a miscarriage 😭 I got blood work done last week and my hCG was 72 and then yesterday I got blood work and my hCG was 604, my doctors want me to go in in two weeks for an ultrasound but i’m terrified i’m having a miscarriage. the blood is only when i wipe, and after 2 or 3 wipes the toilet paper is back to white. i’m not cramping or having any pains either, but i’m just worried..