I don't want kids and planning to secretly get IUD

Update/additional info:

Thanks for the responses so far and respect your opinion. I didn't know I didn't want kids until we were already married. We had a talk before already and I told him I wasn't going to change my mind and he said he chose me and it was okay until his parents died in a car crash and he was depressed and in my attempt to make him feel better I said why don't we try to have kids? It is wrong I KNOW that but its already out there. We have been trying for a year until I got a new job and will not be covered until 6 months so we stopped so I am now back on the Nuvaring and I started exploring the IUD because I saw a flyer in the doc's office. I tried being honest but I don't want to lose him I know we will part ways this time around if I initiate that conversation again and be honest.. I am scared to lose him but I think I know it will come to that anyway, he finds out about IUD then thats a big lie, if I dont do the IUD he'll throw a fit because why did I say Im okay with having kids out of pity. 

Thank you for your time and advice. 😞