FREAKING OUT HUGE

I missed my last period and currently late for one now. I have my tubes tied about a year ago in December after having my last child. I was kinda weirder out so I looked it up online. (Yea I know don't look up medical problems on line) yea I know I know. But I did anyway. I wanted to see if it was normal or if other women had this problem after having tubes tied. And I found out that yes its happen before with others and that it could be three things. I could be pregnant in my tubes whish is very dangerous, I could have endometriosis or something else could be wrong. I'm hoping I'm just really stressed and my body is doing some reset kinda thing.