Is going to be 4 months being on mononessa birth control its hard to get pregnant since i been on it for a while now ? or its still possible to ?

Return of fertility: Return of ovulation ; fertility depends on how long you have been on the oral birth control pill. It can take a few to several months for normal cycles to resume, if no spontaneous resumption of ovulation based on ovulation predictor testing then seek complete fertility evaluation. There could be many causes to explain infertility.