AF late, BFN. :/

Lizz • Married to the love of my life, baby #1 due 11/28/16. :)
AF was due about 12/21. My cycles have always been pretty regular. Without tracking it, I could pretty easily pinpoint a small window when it was going to start. Every once in awhile, it would be a week or less late, which I generally attributed to stress. Even my husband had my cycle down and knew when AF should be coming. I know that my cycle normally is about 30 days. In October, AF was about 5 days late (was due 10/3, came 10/8), which didn't really worry me. Being in the late stages of planning my wedding and working a lot of overtime, I attributed it to stress. Then in November, AF was due 11/6..2 days before my wedding! Needless to say I was extremely relieved when AF did not show up as scheduled..I did not want to deal with it in my wedding gown! I expected it to show up shortly after the wedding. Of course once I was over a week late, I tested..BFN. A few days later, another BFN. AF finally showed up 11/21..making my last cycle 44 days!! I found this extremely odd, but my best friend assured me that, especially with the stress of getting married, it wasn't terribly unusual for this to happen. I figured it would be back to normal this time around, but now I'm on CD 38 and still no sign of AF. Tested this morning and BFN, as I expected. I haven't had any significant weight loss or gain, and I haven't made any drastic changes to my diet or exercise habits. Has anyone else had anything similar? Could my body still be recovering from the stress of the past few months? I have an appointment with my obgyn in a couple of weeks, but I'm not sure if I should try to get in any earlier with him or with my primary physician. I'm completely at a loss. :(