Flight price increased overnight - Help

So I was really happy with the price I got yesterday for a round-trip from Oct 25-Nov 1 to visit a friend, but I had to check with her first. She said yes today, but when I refreshed it the price increased. I'm wondering if it's a weekend price increase thing like they do with motels? Should I wait until Mon-Wed next week to see if the prices decrease or not? Any other advice would be great.