Pill and diarrhea?

I’ve heard that having diarrhea can effect the pill. On friday, i took my pill at 9pm and then around 9:30 had watery stool that i consider diarrhea (tmi, sorry!). Then on wednesday morning I noticed I had a little bit of spotting that was a light brown color that has now continued into thursday. Is this because of the pill not being completely absorbed? I’m worried that it will effect my normal cycle/protection

(Extra info- I did not take another pill after the diarrhea, however i continued to take my pills at the normal time i do the day after)