What are the chances i could be pregnant after a tubal?

I had my tubes tied, cut & burned 8 years ago after giving birth to my daughter vaginally... my cycle has never been late, maybe a day early but never late, its 5 days late now... I've had some mood swings, very tired, nightmares & I never have those, no sickness but I never had it with any of my kids... I guess I just wanna know if this is possible or if its most likely just in my head... I obviously didn't want more children, we have thought about it but quickly snapped out of it when we had nephews or friends children around lol... my kids are 15,12 & 8, they are pretty much independent so I guess I'm comfortable with our life like this but if it did happen we would all be happy, we definitely can provide better than when we were younger! Any input would really help me... I know I need to take a test bc it could be a tubal pregnancy & that needs attention promptly but I'm afraid to take 1...