hi..i had typhoid medication at the beginning of Dec 2012 and a week later i had protected sex. However i did not receive my periods as expected on 25th Dec. Later on 31st Dec i had protected sex but took a dose of p2 pills since i suspected a condom burst, On the same night I had unprotected sex, and took another dose of P2 Pills the following morning.Now its 4th Dec and I have not received my periods but I have feelings like those I have before I get my periods nausea , headache and thigh pains.What could be going on? I am confused...