What do I do now?....

I thought I had a plan. I thought I knew when AF was coming and when I ovulated. I was always regular before pregnancy. But now I'm seeing his wrong I am. I have no idea what the pattern is that I AF and ovulate. I'm hoping I can still O without AF. Inn just unsure as to when to start testing...
My last and only period was April 9th. When should I start to test for ovulation agsin?

You can either buy some really cheap OPK and test one time a day after lunch and then attempt at positive, or you can BD every 4 days.

I got pg with my 4th, in almost your exact same situation. I had one AF, then nothing happened for several months. Then I caught the first egg while nursing, I never got another AF, just had a baby 9 months later!