Sex help please!????

Charlene • I`m 24. Engaged and been with my partner for nearly 6 years. We have no children yet but hoping to conceive!
Me and my partner decided to start trying for a baby but it's like he never wants to have sex! We only ever have sex when we've had a few drinks now.... We've not had sex for 2 weeks! I've put weight on so its really bringing me down! I've tried having silly carryons which usually end up with us ripping our clothes off but nothing! Even texted him while he was at work some kinky texts and asked can we have sex tonight but he comes home and doses off on the couch then when we go to bed he goes straight to sleep! When a spoke to him the last time about lack of sex he simply says well you don't try either! Does anyone have any advice cause am due to scream lol