Positive test one day negative test the next

Ashley • I`m 28. TTC #1.

Has anyone ever had a positive test one day then a negative test the next morning?? I tested out my trigger shot on 9dpo then 11 dpo I tested with first morning urine after sleeping from 11pm-9am then at 12 dpo tested after sleeping from 10-3:30 and it was negative. I'm so confused!!