Trying to be supportive 😩

So my husband is a boat captain, he made a commitment next month to bring a boat for his bosses friend from here in the panhandle of Florida to key west. They are planning to leave February 9th and hoping to return by February 13th, the 15th the absolute latest. I'm so frustrated and upset that he even agreed to this in the first place. He's getting paid to make the trip down there, but I'm so terrified that something is going to happen while he's gone. The last thing I want is for my water to break or go into labor, and he's not here. He doesn't seem to quite grasp this, he's always been a "be positive, everything will work out" type of person. I'm the worry wort, what if? person of our marriage. I have literally made myself sick over it, every day I just want to stay home I don't even want to go to work. He is dead set on going, in his mind we need the money especially since I'll be on maternity leave for 8 weeks. I just don't know how to emotionally get past this, if something happens while he's gone I don't know if I could forgive him.