Need advice

So, I’m currently pregnant (first baby) 5 months at the moment and I live with my boyfriend but ever since we found out about the baby we been arguing about anything😔. Before getting pregnant we were only together for 3 months so everything happened fast in our relationship. Im not sure what to do anymore because I know hes not happy since my mood swings been REAL bad for the past couple of weeks we stay arguing and he wants to leave because of this. What can I do? will it get better after the baby gets here? Or are we just in our lowest point of our relationship right now