Best friend & birthday

So, my SO's & my birthday are on the same day. I am close to my due date (one month) & he wants to go out with his friends & best girlfriend (that I have yet to meet) he said he already invited everyone. I do not want to meet anyone sense I feel huge & uncomfortable constantly. Should I just let him go & give him trust? I just don't want to get jealous seeing girls that aren't pregnant around him, because it's not like my body will be in shape for another couple months..