Could this be a sign of pregnancy?

My period was due, and this past Wednesday I had brown discharge. Thursday I started what I thought was my period. It was a lighter pink (usually bright red), very light flow for 4 days. My period always lasts the full 7 days and is relatively heavier. From Thursday to Sunday, I used tampons but each time I took it out it wasn’t much, I could’ve sufficed with just a panty liner each day, no cramps either. Could this be a sign of pregnancy or just an odd period?

My husband and I use the pull out method which we know isn’t 100% effective 😅