我want ask when sperm 1 meet air , will it die ? 20 marks

i do with gf , never go into her 陰道 , just 體外 shoot sperm , , sperm meet air that time , will it die immediately ?? if sperm flow into 陰道at that time , will have high percentage have BB ma ? in fact the percentage is not high la , i think lower than 1 % becoz i never go into her 陰道 but she late jo 11 day la period , i just afraid my sperm flow from outside into her 陰道 ja , but the percentage is high ma to get a BB thx r , so ugrent