LH levels post miscarriage?

I miscarried at 12 weeks on December 18th. I have been tracking my LH levels with ovulation strips since December 31st and I get a strong line every day (.75 if you use premom) but not a positive just yet. Anyone else experience this? I’m pretty sure I’m testing negative or a very faint line on a HCG test. Not sure if that’s the issue?

How long after did you get a positive ovulation strips?