Off of birth control, TTC

I had an irregular period on birth control this last time. It started on June 11th and ended July 3rd so me and my husband decided to start TTC, so I quit my bc on June 27th so, I guess what I am asking is how can I figure out when to do ovulation tests or do I just need to wait until my first period? I tried 3 ovulation tests this week and all were negative. I need advice! Thanks in advance!