Help please! Cheating husband?!

Emily
Tonight I was trying to sleep but my husbands phone kept going off. I checked it and saw a text from a number and it said "could really use some banging sex right now" and also included a nude picture. Those were the only messages shown. I asked my husband about it and he said that he does not know what they were about. I texted the number and she claims to have sent it to the wrong phone but when I asked for the truth she stated that my husband is Forsure not cheating on me. I'm 27 weeks pregnant with twins, me and my husband just experienced a loss of our 28 day old son almost a year ago. I don't know who to believe.