FTM with a step son...help me

Elle
So I am 6W 5D and lately my 5 year old step son has been getting on my nervous! I'm so scared because I love him so much but there's times since I've been pregnant that I get very irritated!:( it makes me sad because he hurts my feelings and that he doesn't want to listen to me or hes alittle harsh with me. An it be because I'm pregnant or is this how it will be when the baby is born! I want my baby and my step son to be equally loved by my husband and I!!! Help!!