Need to tell him

Hellos ladies. 
I need some advice. I don't know how to go about telling my FWB that I'm pregnant. I was on birth control however, I also take antidepressants and he knows that. I was told the antidepressants won't affect my birth control so I'm not really sure where things went wrong, besides the fact that there is always that slight chance. 
I'm beyond scared that he is going to think I'm trying to trap him or some crazy bullshit like that. But I would never ever do that, I'm only 18 and definitely not ready for children. But, I've realized I have to grow up and take care of my child because abortion is not an option. 
I just don't know how to tell him...

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