Photo of girl who isn’t me..

My husband has a Live Photo on his work phone of some girl he works with on his phone and she’s smiling & waving at him. I’ve never met the girl nor seen her at the work parties and I’m unsure as to how to feel about some girl he felt the need to take a photo of that isn’t me.I’m pregnant with our 2nd baby and I’ve had multiple dreams of him cheating on me and had a weird gut feeling for a bit now. It just seems really out of pocket to me.