Help pregnant or no

My first day of my last period was Novemeber 18th, I'm not sure how long it lasted but I'm guessing it ended on the 23rd. I had sex w/o protection or anything on the 29th of November and the 2nd of October and he came inside both times. Glow said I was suppose to start my period December 16th but I haven't got it so I'm 12 days late, I've taken multiple home pregnancy tests and they are all negative/: I have basically every symptom of pregnancy. I called my dr but I can't get in until middle of January or end of January (my insurance sucks) so does anyone have advice on what to do or why my period is so late? I feel stuck on what to do /: