Tubal ligation and pregnancy

I was wondering how many mommas got pregnant after a tubal and about how long after the tubal did the pregnancy occur. Was it a healthy pregnancy? I had a tubal about a year ago maybe 15 months and I am also taking birth control to control my painful periods. I do not take it at the same exact time everyday. As it's not being used to prevent pregnancy. However I missed my period this month and I am vomiting randomly. I haven't taken a test as I am,kinda afraid of the outcome. I have missed a period before tested and it was negative. I read also in the paperwork for my,birth control it's not uncommon to miss 1 period but if you miss 2 in a row you need to see the Dr.