Spotting on birth control

I woke up in the middle of the night to some spotting while going to the bathroom. Not too much at all, just some on toilet paper.

I used to be on Junel Fe 1/20 and then switched to Blisovi 24. Same type of hormonal birth control. I had sex this morning, but there was no bleeding after that. I take my birth control every single day without fail and there’s no pain associated. What does this mean? Spotting normally doesn’t happen for me so I’m a little confused