Cannot export photos as cloud storage claims to be full, with only 170 photos in Lightroom.

So i just had a surprise engagement shoot, and have just edited 178 photos in lightroom. Now im trying to export them, but an error message appears claiming that disk space is full and so cannot export my photos! I have 50GB free on MacBook disk space. Equally, cloud storage claims to be full, but i have deleted all photos apart from the engagement shoot! It's impossible 170 photos are taking up 20GB space! Please help, as i need to get these photos delivered ASAP!!