What Causes Stomach Bloating And Itchy Nipples?

Just had a baby 8 months ago and we have a 3yr old, lately I've been having a lot of bloatimg , itchy nipples and peeing just a bit more, boyfriend doesn't think so, I am also tired more often but I don't know if I should take a test yet or not. My period is due I'm 2 days periods are more regular since birth