My big dilemma

So I'm on the progesterone only pill. I've been on it for almost three months now. My current pack runs out in a couple of weeks and I'm in a situation where I won't be able to pick up a new one until a month after finishing my current pack. Obviously I'll use a condom meantime but are there any effects coming off the pill for a month will have on my body? Especially as I haven't been on it for long?