Hcg after miscarriage and ovulation

Hi. So I had a miscarriage and have been tracking my hcg to zero. I believe I ovulated last week- a lot of EWCM and I had a tiny bit of brown spotting. Today I got my hcg drawn and it was still 4. Could I actually have ovulated? Or am i crazy and I didn’t actually ovulate? I didn’t take any opk tests bc I assumed my hcg was still above 5.