I am pregnant after tubal ligation!

HI I thought I would share my story here to help others and maybe even find some support myself..
To get the full story I posted in the ttc thread back when I thought I was pregnant the cycle before this one. It may have been a chemical because I did end up getting my period.
Fast forward to now this cycle where I am nearly 5 weeks pregnant after having my tubes tied after our 4th baby.
I am booked in for an ultrasound next week to rule out ectopic pregnancy.
Has this happened to anyone else getting pregnant after a tubal?
Thanks