The other day I was crying for no reason it was the first day of my period. I told my boyfriend what happened and he asked if I was pregnant and I told no that there was no way I could be because my tubes have been tied for almost 10 years. He said I should make sure that I'm not since this was the first time it has ever happened to me. Could I be pregnant even though my tubes are tied?

There are known cases where that procedure become undone... though not highly likely.

But generally you period doesn't come if you are.