Hcg question

Megan

Ok went on 2-15 hcg was 16 after 3 hpt were positive went again on 2-20 hcg was 47 went again 2-25 and hcg is now 613 I had about a week and a half of spotting during this time and we thought I was miscarrying anyone had anything like this happen last period was 1-9 but they have been being between 36-44 days long