Can I become impregnated without the tubal reversal surgery?

In most of my readings on tubaligation and depending on the Doctor Who performs the sx. it seems impossible to get pregnant. Eggs have to come down in order for the sperm to pierce them. I have inquired about fetilization in the office though. And basically it is done in a petry dish, egg and sperm and then put into the uterus, where it should either adhere to the walls or fall through. This is the way most places do it for those childless couples who have chosen a surrogate mother. I'm still looking though, cause you never know. I myself have been sterile for some time but had often wondered if I could still get pregnant with my tubes tied and all. Hope this has shed some light.=Medical book reader,==Gayshagirl=