I have asthma too and during late pregnancy even coughing/sneezing can make the stomach hurt because everything is already so stretched and heavy 😭 Could be muscle/ligament strain from the coughing.
But since you’re already 38+5, please monitor closely if the pain becomes regular, very strong, tightening like contractions, reduced baby movement, or you feel breathless/wheezing worsening. Don’t tahan if your asthma feels uncontrolled also ya mama 🙏🏻 Better to get checked earlier than later at this stage.