There is absolutely no way of knowing, based on this information. To best determine your fertile days, try a charting service like Fertility Friend.
It depends on your cycle. Generally, you ovulate about 14 days before your period. So, if you have a standard 28 day cycle and the first day of your cycle was on the 14th, you would ovulate (be fertile) the 28th.
However, many women do not have a standard 28 day cycle. To figure out your fertile time, you can track your cycle and use an ovulation predictor kit. There are also other signs (basal body temp, cervical mucus) that you can look for.
Ovulation predictor kits can help you pinpoint your fertile days. They do vary from person to person.