Does passing loose stool 2 hours after taking the Belara contraceptive pill reduce its effectiveness?

Hello from about 3 weeks, I started taking belara contraceptive pills 21-tabl +7 days break, since I started taking them I have diarrhea every day, I take pills at a fixed time (7 p.m.) diarrhea appears the next morning, it is a one-time exit to the toilet, my stomach hurts slightly, today I took the pill as usual at 7 pm, diarrhea appeared at 9 pm, this has not happened before, is there a possibility that the tablet has not been absorbed? It was not acute diarrhea, one short trip to the toilet