I had my tubes tied about 8 months ago, I last had unprotected sex on March 20th have had 2 periods, 1 early and shirt now nothing. Pregnant?

Not likely. During a tubal ligation, portions of both tubes are removed. Closure and scarring of the tubes makes passage of an egg extremely unlikely. There are other reasons to explain your irregular periods- these include stress, thyroid dysfunction. An office visit will help determine the real issue.