Relationship rant... I need advice...

Nicole
So, my boyfriend and I have been together for 3 years. From the very beginning, we knew we wanted to spend our lives together and have children. Even though we didn't plan to get pregnant yet, we are both overjoyed and saw it as a blessing. 
I'm extremely happy to be pregnant and to have a child yet I'm worried about my relationship. I can't say that he is bad to me because he's not, he is always asking me how I feel and always making or bringing me the food I'm craving. I'd say we are pretty affectionate. We love each other a lot... I have no doubt about that. 
Well recently, on the side of work, he is starting to get into the music business. I was supportive before I realized that it involved performing in New York nightclubs on the weekends. I have come along with him  a few times since I am 11 weeks but as I get further along, there is no way I'm going to go to a club with my big belly. It bothers me that now of all times he is making these moves in his music career when I need his support the most and we need to bond more than ever. I feel like we are both on these new roads in our lives that go separate ways... I'm preparing to be a mother while he's getting hyped up promoting himself and performing in clubs surrounded by women, alcohol and trouble. I have had body image issues since I was little and I know that my changing body will make me feel insecure and knowing he is going to be surrounded by women whenever he goes out makes me feel like crap. I feel like this is a recipe for our relationship to fail. I haven't discussed my concerns with him yet because I feel bad demanding him to stop doing what he feels passionate about.
This is so long, thanks to anyone who actually read it all. I'd just like some advice on how some of you girls would handle this...