should I say something?

I'm 12 weeks pregnant and currently working as a bar manager at a restaurant (I want to one day own my own restaurant/what I went to school for!)
Well this baby will come right after I finish college and the plan has always been to find a salary job in a different city/state after I graduate and my bosses are aware of that. 
My plan right now is to go on maternity leave shortly before the baby and to not go back to that job after, just move on to a different salary job. 
This will not change my timeline for leaving work but I'm assuming I should still tell my bosses at some point because I'm going to start showing at some point and it might be weird to not say anything? But when/how do I tell them if it's necessary? I don't want anything to change at work or need special treatment so I'm hoping nothing will change, I just really don't know how to go about this 

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