My cycle is so messed up and it’s actually making me depressed

So my periods like 15 days late and I know I’m not pregnant. So this is gonna be long and here’s a back story:

My periods were sooo normal it wasn’t even funny. I knew I was gonna get my period on the exact date and I know it was gonna come around 9am. Well last October that took a total shit on me and i missed a cycle. And then another and another. I went from October 1st-Jan 20th without my period or positive opk. So I took probably 50+ pregnancy tests and they were all very negative so I called my doctor and he just looked at me and did an ultrasound and blood work and sent me on my way with no solutions and said everything looked ok. (I’ve never been on birth control so I knew it wasn’t that)

Now I’m here with being 15 days late again!! and I’ve had no positive opk and I test 2x a day. I just feel like I’m going crazy bec of this.

I just want me body to corporate so that after my wedding in September I can get pregnant and have my beautiful family.