are these pregnancy symptoms?

my period was 5 days late and it finally came, for the first day it was very heavy then it was like it wasn't even there off and on, im on day 2 now of it and its doing the same thing, i usually have a consistant heavy period that lasts up to 8 days. There is the possibility i may be pregnant, I've been hungry non-stop, I have painful lower back pain, I have been feeling slightly ill (but not throwing up), and last night my boyfriend and i were just watching tv and I just started crying out of no where? haha so what do all of you think?