Possible Iud pregnancy??

So basically my boyfriend and I have been having sex. I have the kylenna iud and I have had it since february. My boyfriend also uses the pull out method on top of the iud. My period is 8 days late but I took a pregnancy test last week and it came up negative. Is there any possible way I could be pregnant or am I over thinking? I have no other symptoms but the absence of my period which I know an IUD can cause. Thank you!!