Should i be concerned?

SO left his phone at home this morning open on the bathroom counter. My curiousity got the best of me and i read his texts. He texted a girl asking if she worked today. She replied "how are you gorgeous" and then a second text "have i ever had you over to my house?" He replied simply "no i have never been". Do you think i should be concerned? Or am i over thinking this? Im 7 months pregnant. Good news is he hasnt been over there, but her calling him gorgeous and the house thing??😶 should i say anything about it to him??  i am trying not to freak but it is ruining my day. I almost want to text her and ask if there is a reason shes said that.