FMU testing vs afternoon?

Ivy

I keep getting negatives with my FMU but positives in the afternoon/evening.

Tuesday morning - negative

Tuesday evening - positive

Wednesday morning - negative

Wednesday afternoon - positive

Wednesday evening - positive

Thursday morning - negative

Thursday morning (later on) - faint positive

This was one of my Wednesday positives - it’s DEFINITELY positive (this showed up almost immediately). Has anyone else had this happen?

I’m getting blood work done today to confirm it but I’m just confused as to why this would be happening.