TMI: Could I be pregnant?

So my period is due in 4 days. Last night I wiped and had some light blood. Nothing since. I have been off Mirena since July. My husband and I are trying. I took 2 early pregnancy tests but both came back negative. I know I’m under a lot of stress because my job lately but can that make me spot early? I have never had this happen ever. My period has always been on time and lasts the same amount of time each time.