OPKs after a miscarriage

Hi ladies, so I had a miscarriage on June 23rd and when they took my bloodwork my HCG levels were at an 8. 😭 So here I am now trying to get back into the swing of TTC again. I started testing again with OPKs and have been getting back higher but not positives for days now which isn't normal for me. I'm assuming it's something to do with the miscarriage possibly? Has anyone else had this happen?