Hcg 44 and spotting

Sara

I'm 13dpo. First day of my last period was on Sept 10th. So I'm 3 weeks and 5 days. Had blood drawn today and level was 44. I know I'm early but that seems low to me. My last pregnancy ended up being a blighted ovum at 6 weeks and had a d&c so I'm super paranoid. Having very light brown spotting, which I did last time too but it was more heavy. Prayers and positive vibes please!