I think my husband might be cheating on me....?

Ask your daughter if they are hers just to confirm, ask her if anything weird has been happening to her (did you check for blood one of her freinds could have stuffed it out of embarrment/confusion of a first period). After that confront you husband with your suspicions with panties in hand, IF YOU FEEL STRONGLY about it. If you do ask the questions in a calm and collective manner then wait for his response. No matter what his response you must let him answer and the only thing you can do is believe it. If he continues his behavior seek counsiling.