No sex before IUD?

I've been trying to get Skyla for over a year and FINALLY they are letting me! I had to schedule the insertion pretty far out because my new OBGYN is super booked. They told me not to have sex for two weeks before insertion, which is scheduled for the 21st. They are doing a pregnancy test on the 20th to ensure I'm not pregnant before the insertion.
I apparently have no self control and had sex, with a condom (after like one minute of no condom), last night (12th) with my boyfriend. I freaked out afterwards so he filled the condom with water to check for holes and there were none... 
I am really nervous about the insertion already, now I'm freaking out about possibly ectopic pregnancy, but don't want to have to reschedule. What should I do?   (Please no judgment)