What do I do?

So there's a possibility I might be pregnant and I am no longer with the guy.. if I am I just don't know how to go about telling him .. I'm scared he'll think I'm lying just to get him back which isn't the case I don't wanna get back with him I don't want a relationship I just want to focus on my career and I don't wanna get back with him to make things better because of a baby I feel like that only makes things worse ...