Def need some help - 18 days late & Negative Test

I checked my ovulation everyday last month, every day that was positive we baby danced... I mean, damn... I’ve had some sticky discharge with mild pink/red for the last 2 days. Mild cramps. 2 negative tests, a week ago. We have been trying for 4 years. I know not to get my hopes up, but I’m worried. If I wasn’t ovulating then I wouldn’t care because I’ve been told I have PCOS but never given medication for it. Please please please give me some tips. I’m going to make an appt with my dr this week if I don’t get my cycle by Sunday, which will be 3-weeks late.