Mirena and questions

Hey ladies so I’m new here but I wanted to get some advice.

I’ve had the Mirena since January, I’ve never used protection with my long term boyfriend since I’ve gotten it. I never had any issues up until June I started bleeding after having sex every single time. When to the OBGYN long story short she gave me estrogen pills cause she assumed my body was “trying to start a potential period”. Took the pills and I stopped bleeding after sex. Well Ive never had an actual period on Mirena only slight spotting here or there. In July I had a heavy period for 5 days straight after I assumed my period was over i had light spotting 3 days in a row. It was completely weird and out of the norm for me. Like always I take a pregnancy test around my expected period just to be precautious it was negative. At the end of the 3 day spotting I had a big clot come out of me with some blood. Come to find out it was a fertilized egg that never implanted and my doctor believed that’s why I was having spotting and a heavy period because my body was trying to release the egg and my Mirena blocked the implantation. Ever since this has occurred I’ve been very paranoid and stressed to the point I got plan b when my expected fertile window arrives this month. I know it was stupid and I should trust my iud but I panicked. Now is my expected period I’m two days late with no spotting besides on Tuesday, I’ve had some slight cramping over the past couple days but nothing else and my pregnancy tests have been negative. Should I be worried at all?