Deployed, divorcing, and pregnant

Had a friend buy me a test today. Popped hot. I found out two days ago my also military husband cheated on me while I am over seas. Just a month ago he happened to be passing through my duty station things got a little hot and heavy. Hey, when it has been so long even a rough patch in a marriage can be put aside for a fun night. One thing lead to another now I am looking at a positive pregnancy test right after telling him I am leaving him. I don’t even know where to begin.