Okay ladies... Need some help!

My last period started on 11/20... I had lab work done on 12/10 through my RE, which showed I had ovulated. I have an irregular cycle, but is between 30-34 days usually... AF didn't come, so I took a test on 12/24 and it was a BFN... Here we are, cycle day 41 now and still nothing. I have had cramping daily for over a week now, but still no AF. Is there a chance I could be pregnant? I don't know how I could be, because it would have shown on a pregnancy test, considering I already had ovulated as of 20 days ago... It would have been 14 days at the time I took a test. I'm so confused and don't know what to think anymore. We have been TTC for a year now and I'm beyond frustrated. I have PCOS and got put on Metformin on 11/24, I am already at the full dose of 2,000 mg daily... Anyone been through this? Also... I bought a couple more tests today, and plan on testing with my first urine of the morning, tomorrow... I just don't wanna deal with another BFN! Thanks!