High d-dimer, off eliquis

I recently got off Eliquis from a provoked DVT in April. I was on it for 90 days. It’s been almost a month since I’ve been off thinners and my doctor wanted to check my clotting levels. D-dimer is 2.8 and I’m not sure if this is normal? I left my doctor a message but didn’t get a return call yet.