Pregnant!!

My boyfriend has 3 kids however they live in another state due to personal reasons he can’t go back. Sometimes it’s hard to be with him because well his kids do come first and I’ve always understood that and I accepted him with kids and everything I didn’t mind that.. we have been together for 2 years...With him wanting to go back and wanting to be with me we’ve kind of put our relationship on hold.. however I found out something today. I know I have to tell him but I feel like I’m gonna complicate things more. Some advice please..