Trying to conceive, with irregular periods...PLEASE READ AND HELP

Trane
So every since I stopped my birth control in December, my periods have been every other month,until after my last period in February. I went from March to June without a period. My last period was in July from the 4th to the 14th. And now I'm late again, (11days).
I have took plenty of pregnancy test, and I recently took a ovulation test witch theywere all negative.
So I'm asking for help, because I don't know what to do since my period is very very irregular, and I'm trying to get pregnant?