So confused

So after a miscarriage in march my husband & I have been alot more aware of my cycles & sustaine from sex on my fertile days... today I mentioned to him that I'm ovulating & we should probably hold off... for the last 3 months he has gotten upset, even cold towards me when I tell him 'my app says we should be extra careful' or 'maybe we should wait'. He is the 1 who doesn't want children! I'd love to have another child with him (I have 3 from before) how do I explain to him in another way-that I haven't proved by down loading an app & literally showing him - that his actions hurt my feelings & I'm doing this to support him?? I feel like it's either a selfish reaction to not being able to have sex for a couple days or there is something he needs to open up & express to me, I'm just not sure how to bring it up ... any suggestions??