Could I be pregnant?

my last period started on the 26.12.11 and I have a very regular 27 day cycle so I am due on again on the 21.1.12. I had unprotected sex with my boyfriend from 27.12.11 till the 4th january 2012 when he returned to work. Is there a possibility I may be pregnant? I feel bloated in the stomach and feel moody, but this may be because im due on in a week? I have 2 children already.
Thanks

There is no time in your cycle where you can have unprotected sex and be absolutely certain you will not become pregnant. There are just times when the risk is much greater than others. Take a pregnancy screening test and make sure you follow the instructions on how long after the exposure you should wait before taking it.

The web page below has nine links at the bottom. If you understand all of the information on those pages, you will clearly understand how it works and the risks of different behaviors.

Planned Parenthood:
http://www.plannedparenthood.org/info-for-teens/pregnancy/am-pregnant-33831.asp