Need some advice

If you thought your significant other was hiding something from you how would you go about confronting him? I am the type that totally hates confrontation but I can’t stop thinking about it. What i think he’s doing isn’t even really a huge deal but I’m 30 weeks pregnant and just can’t stand the thought that he needs to hide something from me. I don’t really want to straight up ask him if he’s doing what I’m thinking he is and accusing him but i just need to know.

Any advice!?