Hi, I Have A Question Regarding STD. I Stay With

Hi,
I have a question regarding STD. I stay with my husband in USA. My husband family stay in different country. I know that My brother in law used to go to sexworkers. He confessed it to my husband. My brother in law tested for STD within 1-2 months of that incident. He was tested negative for STD. Now, My husband went to meet his family. My husband is sharing his cloths, razors with my brother in law. My brother in law even share his food (in same plate) with my husband. I am worried. I am curious if my brother in law is carrier of STD and if this kind of activity transfer STD to my husband. I am planning to make baby. I do not want to put my or my baby's life at risk for STD. Please provide me any suggestions you have for me