Can I be pregnant?

I had my tubes tied 5 years ago! I’m a mother of 5 & is 41 yrs old so I can’t say I was trying! Well I’ve been SO nauseous for the past week or so. Once I informed my husband that I’ve been nauseous he revealed he’s been feeling the same. So I down loaded this app to start tracking when I’m ovulating & realized my period was 15 days late! I know some women have gotten pregnant after having their tubes tied so I was just asking? I’m so nervous just the thought!