Ovulation after miscarriage

Anzel 🇿🇦 • Happily married with a beautiful little girl (2019) 🥰 and four angel babies (05/2016, 05/2020, 10/2020 & 09/2021).
Quick question. I am on CD11 - I counted my miscarriage and D&C day as CD1. I took an ovulation test this morning and it is starting to get darker. 
I assume my HCG is at 0 because bleeding and spotting stopped about 5 days ago. My question is this: Is it possible for the ovulation test to pick up leftover HCG, if any?  Can I make the assumption that my body is gearing up for ovulation. Any thoughts??