Could I be pregnant?

Patient: Towards the end of October I had my menstrual cycle and had sex in the beginning of November. In November, I didn’t get my menstrual cycle however in December I got it on the 9th. I was expecting to get this month around the same time but it’s almost the end of the month and nothing. Lately I’ve been more tired than usual, I eat a whole lot more than I used to, my mouth tastes like blood but I haven’t cut myself, sometimes I have lower abdominal cramps, and mild headaches. Could this mean I’m pregnant?