 [ Symptoms ] can heat affect a pregnancy test  i took a test yesterday morning and it did not have very visible + sign when i checked i put in my car with windows down and came back 10 minutes later to check it again and it had a faint but visible + sign does that mean i am pregnant or was it false because of the heat should i take another test [ Disease ] it can help i also have osa and use saline nasal spray just before bed and try to clear mucous from my nasal airway my cpap only covers my nose so i need a very clear and patent nasal airway in order to get sufficient air