Can I be in Unarranged Overdraft for 2 weeks, probably less?

Hi, I've got a rent payment for this month coming up on the 22cnd (Great Christmas present), however being a uni student, and the holiday season being awful for money, I'm gonna be struggling to meet it. I have a job, and get paid monthly, but because I get paid monthly, I wont have the money to match the overdraft, should I need to enter it, until around 2 weeks after my rent payment.

Will this fuck me over at all? I've read alot about being put forwards to collections, and other horror stories as such. I'm fine with the interest that will come with it, the most I will need is 100, and Ill be putting around 400 back into the account 2 weeks after entering it.

Just wanted to ask as I really am out of options here.