Hi. The first day of my last menstrual period wad 10 dec. My husband and I had sex on 3rd jan and until now I haven't had my period. Am I pregnant?

Maybe. If you posted this today you are about a week late. Obviously some women are less regular than others. You might be pregnant, more likely you are not. If you want to know, get tested, its a simple urine test, or see your doctor.