Weak positive

Amber

My last period was Oct 25, we had sex like post ovulation nearly by Nov 20’s. Today I went to the hospital to give a urine test, it’s been 42 days since my last periods. The test was a “weak positive”. Then I took a blood test and it was negative. What is happening ?

I’ve been waiting for 12 days post my expected af date, is this could be or a definite no ?