Newly pregnant

So I’m about 8 weeks (I don’t go in for the confirmation/first ultrasound for 3 more days) and I’m feeling so insecure about my body right now it’s wild. I’ve already gained about 5 pounds since I found out, and the bloating that I’m dealing with makes me look like I should be 5 to 6 months pregnant and not just 8 weeks. This is my first pregnancy, my husband and I are supposed to go to a birthday party tomorrow and I don’t even want to go see his family because I’m afraid of the looks I’m going to get when making a plate of food to eat. Is it normal to already be packing on weight like this due to inability to poop/bigger appetite? Am I acting crazy by not wanting to attend this event? Please help!