Not a expert on this, but from what i have read, and seen people talk about. I can take up to a year for your body to get back to normal, and get pregnant after taking the pill. But i knew a few girls that did get pregnant while using the pill, and one that had her tubes tied. Any thing is possible. If it was last month then it might be enough time to take a test.

So you completely skipped four days of the pill? Then yes, you certainly did increase your chances of getting pregnant. The pill needs to be taken every day and at the same time every day in order to be as effective as it can be. The more days you skip, the less effective it is going to be.