I am currently on the 4th pack of Atywia Daily and 3 days before taking the placebo tablet I had a slight spotting. Is this normal? Does such spotting weaken the effect of contraception?

Spotting may occur when using hormonal contraception - especially at the beginning of treatment (first few cycles). Usually, the problem goes away on its own and has no effect on the effectiveness of contraception if the pills are taken correctly. If irregular bleeding persists for a long time, it is worth discussing the problem with a gynecologist. I encourage you to read: https://www.gdziepolek.pl/artykuly/antykoncepcja-hormonalna https://www.gdziepolek.pl/artykuly/jak-prawidlowo-stosowac-antykoncepcje