Feeling guilty

Me and my husband to be having be trying for our first baby together for well over a year now, he's already got a kid to a previous relationship, we both really want this but seems he wants it more then me, I missed a period also been having pregnancy symptons, he keeped asking to buy a test but I was putting it off, finally I bought one today and it's negative, he's so happy thinking I might be, hate letting him down even though hes so understanding! Just worried incase I can't have kids 😢