Did I wait long enough?

I got the Kyleena IUD a little over 2 weeks ago, my BF and I had unprotected sex for the first time since. I’ve had cramps and I’m spotting which I think is normal but I’m also very paranoid and need reassurance. My doctor didn’t talk to me about how long to wait and those details. I also googled but there was so many different answers nothing really helped. What do you guys think? Or what has been your experience? Should I take plan B?