Advice PLEASE

Becca • Wife • 3/30/12 💏 Mother • 9/30/15 👧🏼 Baby #2 • 10/9/18 👶🏼

10, 11 & 12 DPO - faint line on FR

12 DPO - a little brownish spotting in am, nothing since

13 DPO - Faint positive with SMU

14 DPO - Negative FR with FMU, faint positive with afternoon pee, negative FR digital with pm pee

15 DPO - Negative FR digital with SMU, negative with afternoon urine

Have not started my period, have not had any bleeding or spotting since 12 DPO, and have zero clue what’s going on. Assuming it was chemical?