Pre-Appointment Advice Wanted!!

Hello ladies :) some of you may have seen some of my posts about getting up there in the cycle day numbers (cycle day 80, 100.) I am now on cycle day 109, soon to be 110. My last period started January 15th and lasted 7 days like usual. Then on February 8th I got the news that my older brother passed away unexpectedly at 22 years old. I haven't had my period since and I at first attributed it to the stress from the loss. My husband and I have also been TTC for going on 14 months now. Every hpt is negative. I have a doctors appointment on May 21st to see what is going on both fertility and health-wise. (I lost my mom in May 2012, both her and my brother had blood clots.) I check cervix and CM every day and do far my cervix is always hard and low and my CM is basically nonexistent. Any tiny amount is thick and creamy and white. My brain is freaking me out by convincing me that I'm one of those women who HPTs don't always work for but I really don't think I'm pregnant. So do you guys just think it's probably the stress???