Crying? How early did it happen to you?

Hi everyone. My DH and I are ttc after a miscarriage. I have PCOS so it's not been easy. Anyway Im currently 16dpo and go on to the doctor tomorrow for the hcg test. All weekend i've been super emotional. Like the simplest part of a TV show has me crying my eyes out. How early has any of you experienced uncontrollable crying? I feel like it's too soon for me and that's if I'm pregnant. Any thoughts?