HCG levels after miscarriage??

Can anyone share how long it took their HCG levels to go back to normal after a medical miscarriage? I went to my two week post miscarriage on Thursday and they took my blood and the midwife said I should be at 0-5 but my results came back Friday and it was still at 113. This is my first miscarriage and I know people say sometimes tissue or placenta stays behind and it can lead to infection ? I feel so lost like no one explains anything and I don’t know the right questions to ask it’s so frustrating.