Kyleena IUD

I had my kyleena IUD put in about a month ago on the first day of my period. I had spotting only for about 1-2 weeks. The it’s supposed to stop my ovulation, but sometime it seems like I have clear, stretchy discharge. Isn’t that fertile? My boyfriend and I have always used condom except for once, BUT he always pulls out. About last week O start spotting again for a few days, and then I actually very lightly bled. I had light/mild cramps those days. (I was supposed to be on my period). I check my strings and it feels fine, doesn’t feel like my IUD is falling out. I do know your cervix changes and moves through out my cycle so the strings aren’t always the same length. But, roughly the same length. Does this all seem ok? I am known to freak myself out. My mom just says I need to trust my IUD