Kyleena IUD, but condom broke

Hi all, I recently had an experience where I had sex with my partner and the condom broke. I didn't completely finish inside her (we arent sure if any got in there, even, as I tried to pull out before finishing which is why I think the condom broke - she was on top) but I'm not sure how much risk I'm at here. I'm nervous because that is the first time I've ever had a condom break. Now all of this (the sex) happened on 9/9. On 9/15 she mentioned to me that she got her period and it was normal according to her but I've read that bleeding can happen down there for so many reasons. One would think that since sperm lives inside for only 5 days, if she had her period 6 days after sex, then a period coming at that point would rule out the possibility of pregnancy right? I'm not sure, since this stuff is complicated. She says she thinks I don't need to worry, but like I said, just having some anxiety here.

Anyone have a similar story? or some numbers/info to ease my nerves a bit? Thanks!