Swiped notification accidentally but it seemed useful or you accidentally cleared everything in the notification drawer without meaning to. Here’s a solution for you. You can do check your dismissed notification in 2 ways, let’s check them both.
How to look without using a third-party app:
Step 1: Long press anywhere on your home screen

Step 2: Click on Widgets

Step 3: After dropping that widget on the home screen you will be shown a list, swipe down until you find notification log.

Now, you can check your previous notfications from this widgets.
If this thing doesn’t work on your android phone you can install a third-party application. You can download it here.
Let us know in the comment section if you face any problems with this process.