Don't know what to think

So my husband has been texting back and fourth this woman he says it was all work related and it is mostly during work but there's also a day where he was off and they were texting back and fourth for about an hour . When I found out today she called me and said that it was work related and apologized if there was any confusion and to call her blah blah.... But I feel as though there could've nothing about work that you could possibly text back and fourth that much about . Mind you this is a second part time job at a hardware retailer and the text are about orders . Lady's please give me your honest opinions. I'm 8 months pregnant with his child and don't even know what to think . He's lied to me in the past for little things but we've never had issues with cheating etc.