Hcg levels 89 brown bleeding freaking out

Natasha

My last period was on 2nd August I got a positive on clear blue digital on the 10th September all tests were negative up until this date I went to the doctor to confirm on the 11th she got a faint positive on both her tests the last 4 days I’ve been having brown blood when I wipe no cloths so went for ultra sound and enteral exam today nothing in uterus and nothing around ovaries so they drew blood my hcg levels were at 89 they are saying they are quiet low as I my dates are saying I am 7w3d has anyone been in a situation where they weren’t quiet as far along as they thought and everything turned out ok I’m back up on Wednesday to do more bloods to see if hcg doubles ?? They are saying they are not sure if it’s an early pregnancy or if I am miscarrying