Faint positives but negative blood test

Shannon

Got my first faint positive at 13 dpo. I'm 16 dpo now and my lines are slightly darker but still faint. Decided to go get a blood test to confirm and it's negative. 😔 Not sure what to think. Too soon or chemical? I miscarried April 16th of this year.... trying to stay positive but also trying to not get my hopes up.