Please please help me

I am highly frustrated at this point. I'm on CD 75 no spotting, no AF since March 28 and that lasted until April 3. My DR put me on Metformin on May 22. I have been taking Metformin for 3 weeks now. On May 29 I got my first positive opk. Also had EWCM that day. We BD every other night since then because my opk are still coming up positive. I took a pregnancy test today, 2 days ago and both was neg. Nothing but creamy cm since then. I did another opk today and its a blazing positive. My cervix is so high I can barely feel it and its closed today. What is going on did I not ovulate? Could my test be wrong?