Are these signs of pre-diabetes?

In the mornings my sugar level is usually in the lower 70's. After a meal its usually in the 200's. After a while it goes to normal range. (i used grandmas machine to check my sugar, i don't have my own sugar tester) After a meal i always have dry mouth and I am constantly thirsty. I have gained weight rapidly. If i don't have breakfast and i delay lunch, my hands start to shake and I sweat. Can this be pre-diabetes?