There are a few ways to check if someone sent your Instagram post.

  1. Check the timestamp of the post. If it’s after 6pm, it was likely sent by someone else and not you.
  2. Check the hashtag associated with the post. If it’s #your_post, then it was probably sent by someone else and not you.
  3. Check if there is a reaction from other users on Instagram. If there is, then it’s likely that someone liked or commented on the post.