still have a milk supply after a yr and a half?!

My daughter is almost two and I haven't breast fed in over a year in a half and still have a good enough milk supply that it sometimes leaks a little and if I squeeze my nipples it will squirt  everywhere. Recently noticed the last couple days it seems to have almost increased again.. basically asking if a.) is it normal to still have a supply after that amount of time and b.) could it suddenly seeming to increase be an early sign of pregnancy?