Nexus 5 on 4.4.4 topic

So ive searched the web and here and couldnt find the answer to my question but i recently got a replacement nexus 5 and it hasnt recieved the ota for 5.1. I was trying to find out why? I got it right before 5.1 was released so i understood why i didnt get 5.0 but still no dice, i understand i can sideload it myself but ive had issues with that before. Any help is appreciated.