Could I be pregnant?

My last normal period was on Sept. 1st. Then I got a very short period on October 16th. (45days later) It was 2 days long. Then my next period didnt come till Nov. 20, which was 35 days later. Again it was very short, maybe 2 days? Not very heavy. That was the last period I had. I was due to have it around Dec .17th. I took HPTs in october, but they were negative. I took one is Dec. and it was negative. What to think? I am usually very regular, around 28 day cycles. I did experience a major stress in October, my DH passed away. However, by the time that happened I was already 2 weeks late.

Its not good or bad news either way. Im actually indifferent to the idea. Im just frustrated because I never know when to expect it. I made a dr. appt, but they cant see me till next week. I really think its a lot of stress, but Ive had other symptoms that are probably all in my head. I have had cravings for certain foods, tired, nauseous at times- but this could be due to stress. I have a almost 3yr old DD, so I am a,ways busy and dealing with tons