Not sure how to grieve

I have pcos so my periods are irregular but I had my suspicions. I went to my lady doctor and told her that I felt off. I even asked her to do a blood pregnancy test but she refused. I felt like nobody believed me and that I was making it all up. Then on July 19th I miscarried.. At first I thought it was my period but 10x worse. It wasn't until I saw a small grayish bubble the size of a blueberry that I realized that I was right. In my heart I know I was pregnant but I can't help but feel like I'm wrong even though I saw and felt it for myself. I don't know what to do. It's been 3 months but I still haven't grieved. I'm not sure how to other than to cry.