Would you be concerned?

My husband and I have lived in the same apartment complex for about 3 years. There are no washer and dryers in the units so everyone in the complex uses community laundry facilities. Over the past 3 years there has been 2 times I have panties that were not mine in the clean laundry. Didn’t notice them when I was putting the laundry into the washer) now today I found a sports bra-once again didn’t notice it. I have no reason to believe he is cheating-it just makes me wonder every time I have found them. I tell myself it’s likely someone left in the washer/dryer that I didn’t notice..but is it? What would you think?