I'm so confused

Ugh i feel like a kid when I come here and try to talk about things, but i have absolutely no one else.. so please if your going ro be mean and talk bad about me just dont say anything.. well here it goes, the so and I have been trying to have a baby for about a month now and it just seems to be getting worse everytime.. sex used to be fun, we could have it anywhere, anytime, we was always ready to go... and now it's just like poof gone. We arguing over the stupidest things, I'm so emotional, I work full time, plus come home at 7am and take care of my son and clean up the house a bit.. he don't work at the moment witch I am okay with, if he were to get a job I'd be okay with that too.. I am supportive either way. Let's take today for example. We had a little quicky and then he walked next door to see his friend while I got my son down for bed.. I text him good night and he came home.. we started loving and kissing everything was going great, we went to switch up positions and he got soft... I gave him some oral and went back to doing what we were doing and he kept getting soft.. is it me.. am I doing something wrong.. I do nothing but try to keep a smile on everyone's face and I believe I forget about mine sometimes.. I am just so lost can someone e help me..