What is your opinion of tubal ligations?

What is your opinion of tubal ligations?  My husband and my mother both think I should have my tubes tied.  I am 36 years old and have only one son who is nine.  Since his birth I've had many miscarriages; his birth was a miracle. I am due with another son and am perplexed now as to whether or not I should have my tubes tied after his birth.  I’m concerned about more miscarriages and I don’t know if I want more children or not. I don't want to do anything with selfish motives.  I can't decide what to do.  —C.K.