Stepson and being hormonal ...

Rachel
I have my stepson over the summer, my 2 year old daughter and I'm pregnant with my second baby. 
During the school year my husband and I have my stepson everyother weekend. I do not have a good relationship with my stepsons mother so it's a very strained ordeal. Now that I'm pregnant again my hormones are insane, not like they were when I was pregnant with my daughter, everything sets me off. Raising my daughter a certain way and him being raised with no consequences, rules or manors makes things very difficult. 
Am I over reacting or are these pregnancy hormones getting the best of me?