What would you do?

My SO and I just moved in together this weekend. I go to do laundry this morning and find a condom in the dryer (He was the first to do laundry). My SO and I do not use condoms so it's making me wonder why he has them. The no brainer answer is that he may be cheating but I don't want to make any assumptions but the evidence is clear. How would you address this. I'm 4 months pregnant and very much in love with this man.