I have given birth to a baby girl on 19.07.2013. Since then till now my menstrual period has not been started. On 25th January, 2014 it happened like , unprotected sex happened .Is there a chance that I may conceive ? I am really worried as do not want to get pregnant now. Please help

Just because you are breast feeding doesn't mean you can't get pregnant... because you very much can.

If you are worried about getting pregnant... you ALWAYS use some form of protection.

Yes it is possible.