I had unprotected sex a few days before last months period. I had my period as normal and it started on the 6th July, however it was lighter than usual and only lasted a few days. It is now the 11th August and i still havent come on my period, having said this my periods are quite irregular. I know its unlikely to become pregnant as you are most fertile 14 days into your cycle, however I am still worried as my periods are so irregular. Please help me by giving me your thoughts.