Wow you need to either leave him or speak up. I do not mean to sound harsh but this is ridiculous!
He is obviously hiding someone or something and doesnt want you to know about it, and it sounds like another woman. You need to comfront him and demand explanations. There is no way he doesnt know how messages get on his phone and its completely disrepectful to go into the restroom and turn on the fan with you there. Im sorry if I sound angry. I have been through exactly what you are going through and trust me it tore me apart.
So the first thing I would do is ask him if hes with someone else. And until you get an answer I would stop trying for a baby. What hes doing is totally unfair to you and it will be to a baby. Also if he has cheated then he doesnt deserve the family you are willing to give him.
Then depending on what he says and what you beleive, you should decide how much lying you are willing to take.
But the bottom line is once they use you and lie to you they almost always do it again. Because you havent said or done anything then he thinks this is ok. I guarantee you he will not like you asking him questions.
Again Im sorry if I sound harsh or mean. I dont know the whole story but I have been used and abused and I knew it. But i loved the man soooo much that I stayed and always took him back. As a result of his cheating I was given genital herpes and lost 3 years of my life. Please dont let this kind of heart ache happen to you or a child.
Please keep posting and pm me if you like