IS your boy being cranky too? He could be teething. Cause when dear son was teething, he will also wake up freqeuntly at night, not asking for milk but just waking up and fuss around, sometimes even cry very badly. The problem goes off only after his teeth came out.
As for being pregnant, I think your family has no say in it. They are not the one who can comment whether this is the right time for you to have #2 anot. Though you might think it is very tiring to have #2 now, and somemore is an unplanned pregnancy. But since you are pregnant alrdy, why not change your mindset and think positively? =)