Question on 2014 estimated quarterly payment

[Andelin]

One of my clients didn't pay a December 2014 invoice until January 2015. As a sole proprietor, I had already paid tax on it in my 4th and last estimated quarterly payment for 2014. Do I need to pay again this coming 1st quarterly payment for 2015? And if so, does that mean I will have overpaid in 2014 and that will get included in the tax refund I normally get each year?
Thank you ahead for comments/answers.