Could I be pregnant?

Patient: Dear Doctor, I have noticed that my breasts have gotten bigger, fuller, rounder lately and my areolas are puffed up. I had non-intercourse sexual activity with my boyfriend 13 days ago. There was dry-humping, fingering and oral sex involved. I am due for menstruation on approximately the 18th or 19th December and my last menstruation started on the 19th November. My boyfriend had tight boxers and shorts on during the activities and he did not ejaculate. I am however worried that pre-ejaculate could have gotten inside of me and made me pregnant. He has not had an ejaculation for a very long time. Could I be pregnant??