<human>: Can you provide a brief overview of the text?

Long story short, my SO's bff is moving to our city and is a single parent. He is guilt tripping my SO to watch his son, for free, overnight "just a couple days a week" while he's working. (He can only afford a babysitter 3 out of 5 days a week.) I feel like I can't say no because they're like brothers. I don't like that I won't be sleeping next to him for that amount of time or that he's being guilted. I feel like this is going to be a huge interference in our life and I don't want the stress of trying to conceive on top of it.

I also feel like I'm being overemotional and dramatic though. I feel like my SO is "the one", we're going to get engaged soon and have been trying for a baby since November. However, I'm afraid that the worst case scenario, in addition to not being able to sleep next to him twice a week, is that his best friend living here (near us, not with us) will be a big interruption in our lives. I don't care if they hang out, but I feel like things are going to be excessive. 

I am being selfish, but at the same time I feel like I am entitled to that. If my SO had a child when I met him, I wouldn't have ever dated him. Despite how in love I am with him, if he turns out to have a large role in taking care of this child, I could see myself breaking up with him. I know when we have a child, a lot of the attention will be off me, and that's fine and expected. Great, even, because I want OUR child to be loved. (Hope this makes sense!)

Am I being overemotional or "smart" about wanting to hold of on trying to conceive? If I decide to wait, how am I suppose to tell my SO about it without seeming like I'm sort of blackmailing him with it?
<bot>: My SO's bff wants him to watch his son, aint nobody got time for that. Am I in the wrong here?