Would you be mad?

My boyfriend went to a bachelor party is Vegas for 5 days, and left me with our 18 month old son. Now I am currently 7 weeks pregnant and having a very difficult time with nausea, I am usually on the couch all day cause I feel so sick. I feel like he should be home. I don't get to just pack my bags and leave for 5 days why should he? I think he's being really irresponsible and we don't exactly have the money for him to be blowing money in Vegas with another baby on the way... And there's a ton of stuff that needs to be done around the house! Am I overreacting? Just want opinions.