Cycle buddy af unknown

Michelle
Hey! My name is Michelle but go by Shelly. My boyfriend and I just started trying. I'm ttc #2 but it will be #1 for him. Af is unknown. I got my iud removed on April 27th. I'm new to all this. My first child who is now 9 years old was a complete surprise. I've never actually tried. And advise is nice. How do I know when af will come if she's been gone for so long? I'm completely lost!