Not a teacher
Think about these:
1a. There have been few adventures for two weeks.
Not much has happened for two weeks. (Within a wider context)
2a. He told his men to be attentive to the call of his horn warning them of trouble
3a. Robin Hood was set on not letting any stranger, whether big or small, pass.
Your option corrected:
There has been nothing interesting for two weeks
Maybe it will serve as food for thought.
Student or Learner