Any females that started birth control pills have weird bleeding?

I’ve only been taking the pill a little over a month and I got my period right as I started taking the nonhormonal part of the pack. I bleed like two days which is usual for my periods but I’ve noticed that it’s like I’m spotting some still. Like I can have sex with my boyfriend and there be no blood then the next day I’ll have blood in my underwear. Before I started the pills I never ever spotted so Did something similar happen when you started taking the pills or should I be worried something else is wrong
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